Aquatic Beasts

by CanceRevolution

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Aquatic Beasts

These natural aquatic beasts, whether they reside in freshwater lakes or the sprawling oceans, have inspired wonder, reverence, and sometimes fear among those who encounter them. From the frigid polar realms to the steamy tropics, these creatures have carved niches for themselves in some of the most breathtaking and challenging environments imaginable.

In the vast open oceans, colossal creatures like the blue whale dominate, their sheer size and power unmatched. These gentle giants, despite their enormity, feed primarily on tiny krill, filtering vast amounts of water through their baleen plates. On the other end of the size spectrum, schools of piranhas dart through freshwater systems. Their feeding frenzies, especially when provoked or during the dry season, can indeed be a sight of nature's raw power. Meanwhile, lurking in the mangroves and freshwater waterways, the formidable saltwater crocodile, with its armored hide and jaw strength, waits with timeless patience for unsuspecting prey.

Tier 0


Crab

Beast, Tiny

Tier 0, Challenge Point 1, XP: -

Attributes

AC 4 AP 3
HP 1 Posture 1
  • Passive Insight/ Perception 8
  • Senses: Blindsenses
  • Language None

Movement

Base/ Swim (breath) 5 Climb 0 Dash 5

Stats + Skills

STR -4 DEX -4 INT -4 WIS -2 CHA -3
  • LU +0: Luck Points: 0; Critical Fail: 1

Ability

  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks

Action (1)

  • Pinch Hit -4, Dmg 1 thrust

Fish

Beast, Tiny

Tier 0, Challenge Point 1, XP: -

Attributes

AC 7 AP 0
HP 1 Posture 2
  • Passive Insight/ Perception 8
  • Language None

Movement

Base/ Swim (breath) 25 Climb/Walk 0 Dash 10

Stats + Skills

STR -3 DEX -1 INT -4 WIS -2 CHA -3
  • LU +0: Luck Points: 0; Critical Fail: 1

Ability

  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks
  • Water Breath If you are out of water for more than 1 minute, you start to Suffocate.

Frog

Tiny, Beast

Tier 0, Challenge Point 1, XP: -

Attributes

AC 11 AP 0
HP 1 Posture 4
  • Passive Insight/ Perception 10
  • Language None

Movement

Base/ Swim (breath) 15 Climb 5 Dash 10

Stats + Skills

STR -3 DEX +3 INT -3 WIS +0 CHA -3
  • LU +0: Luck Points: 0; Critical Fail: 1

Ability

  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks

Penguin

Beast, Tiny

Tier 0, Challenge Point 1, XP: -

Attributes

AC 6 AP 0
HP 1 Posture 3
  • Damage Resistance Cold
  • Passive Insight/ Perception 12
  • Language None

Movement

Base/ Swim 20 Climb 0 Dash 10

Stats + Skills

STR -3 DEX -2 INT -3 WIS +2 CHA +2
  • LU +0: Luck Points: 0; Critical Fail: 1

Ability

  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks

Tier 1



Crocodile

Large, Beast

Tier 1, Challenge Point 2, XP: 2

Attributes

AC 7 AP 3
HP 17 Posture 10
  • Passive Insight/ Perception 14
  • Language None

Movement

Base/ Swim 25 Climb 0/ Walk 15 Dash 30

Stats + Skills

STR +5 DEX -2 INT -4 WIS +4 CHA -3
  • LU +0: Luck Points: 0; Critical Fail: 1

Abilities

  • Hold Breath You can hold breath for 10 minutes

  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks

  • Water Ambusher You gain advantage on Stealth Checks while underwater. In addition, creatures that are not fully submerge in water are considered completely Blinded when interacting with you.

Actions (1)

  • Large Bite Hit +5, Dmg 1d12 thrust
  • Grapple: On a hit, the target becomes grappled by you if it is Large size or smaller. You can only grapple 1 creature at a time.

Bonus Action

  • Quick Hide You can Hide as a Bonus Action.


Giant Frog

Large, Beast

Tier 1, Challenge Point 2, XP: 2

Attributes

AC 10 AP 0
HP 17 Posture 10
  • Passive Insight/ Perception 14
  • Language None

Movement

Base/ Swim (breath) 25 Climb 15 Dash 30

Stats + Skills

STR +5 DEX +2 INT -4 WIS +4 CHA -3
  • LU +0: Luck Points: 0; Critical Fail: 1

Ability

  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks

Action (1)

  • Bite Hit +5, Dmg 1d10 strike
  • Swallow (Concentration): On a hit, the target must succeed on a Brawling Save (DC 13) or be swallowed by you if it’s Medium or smaller. While swallowed:
  • • Shares the same space as you.
  • • Is in Full Cover.
  • • Becomes Paralyzed if it has 0 Posture.
  • • Takes 2d6 acid damage at the start of its turns. Any Construct or Armor/Shield/Weapon being used by a creature also takes 1 Corrosion Point when they take this acid damage.
  • You can have 1 creature swallowed at once, but you vomit if you lose Concentration.


Giant Octopus

Large, Beast

Tier 1, Challenge Point 2, XP: 2

Attributes

AC 12 AP 0
HP 14 Posture 10
  • Passive Insight/ Perception 10
  • Language None

Movement

Base/ Swim (breath) 30 Climb 15 Dash 30

Stats + Skills

STR +2 DEX +4 INT +0 WIS +0 CHA -3
  • LU +0: Luck Points: 0; Critical Fail: 1

Abilities

  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks
  • Water Breath If you are out of water for more than 20 minutes, you start to Suffocate.

Action (2)

  • Tentacles Hit +4, Dmg 1d6 strike
  • Grapple On a hit, the target becomes Grappled if it is Large or smaller sized. You can grapple up to 3 Medium or smaller creatures at once, or just 1 Large creature at once.

Reaction

  • Black Ink When you take any damage, you can release black ink which covers an area within 30 feet of you. All creatures in that area become completely Blinded. You must be underwater to use this ability.
  • Big Triumph: You can only use this Action once.


Dolphin

Medium, Beast

Tier 1, Challenge Point 2, XP: 2

Attributes

AC 14 AP 0
HP 12 Posture 12
  • Passive Insight/ Perception 16
  • Senses Blindsenses
  • Language Whale Language

Movement

Base/ Swim 35 Climb/Walk 0 Dash 20

Stats + Skills

STR +0 DEX +6 INT +1 WIS +6 CHA +2
  • LU +0: Luck Points: 0; Critical Fail: 1

Ability

  • Echolocation You lose Blind Senses and become completely Blinded while Deafened.
  • Tracker You gain advantage on Nature Checks
  • Pack Hunter You gain advantage on Attacks if there's an ally within 5 feet of the target you're attacking.
  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks
  • Hold Breath You can hold breath for 10 minutes

Actions (1)

  • Bite Hit +6, Dmg 1d8 thrust
  • Armor Piercer: You ignore 2 AP
  • Tail Hit +6, Dmg 1d6 strike
  • Water Bash: On a hit, a creature is pushed 10 feet away from you while underwater and take extra 1d6 strike damage. This Attack deal double Posture damage.


Giant Glowing Octopus

Large, Aberration/ Beast

Tier 1, Challenge Point 8, XP: 8

Attributes

AC 12 AP 0
HP 34 Posture 20
  • Passive Insight/ Perception 20
  • Language None

Movement

Base/ Swim (breath) 30 Climb 15 Dash 30

Stats + Skills

STR +2 DEX +4 INT +0 WIS +0 CHA -3
  • LU +0: Luck Points: 0; Critical Fail: 1

Abilities

  • Electric Charge If a creature within 5 feet hits you with a Melee Attack or touches you, it takes 1d4 electric damage, which deals double Posture damage.
  • Electrical Sensors Your Passive Perception is increased by 10, but you become completely Blinded for 1 turn when you take electric damage.
  • Glow You automatically fail any Stealth Check, and you illuminate a 60 feet area.
  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks
  • Water Breath If you are out of water for more than 20 minutes, you start to Suffocate.

Action (1)

  • Tentacles Hit +4, Dmg 1d12 strike
  • Grapple On a hit, the target becomes Grappled if it is Large or smaller sized. You can grapple up to 3 Medium or smaller creatures at once, or just 1 Large creature at once.

Reaction

  • Black Ink When you take any damage, you can release black ink which covers an area within 30 feet of you. All creatures in that area become completely Blinded. You must be underwater to use this ability.
  • Big Triumph: You can only use this Action once.

Tier 2



Electric Eel

Small, Beast

Tier 2, Challenge Point 4, XP: 8

Attributes

AC 14 AP 0
HP 24 Posture 12
  • Passive Insight/ Perception 26
  • Language None

Movement

Base/ Swim (breath) 35 Climb/ Walk 10 Dash 20

Stats + Skills

STR +1 DEX +6 INT -2 WIS +6 CHA -3
  • LU +0: Luck Points: 0; Critical Fail: 1

Abilities

  • Electric Charge If a creature within 5 feet hits you with a Melee Attack or touches you, it takes 1d4 electric damage, which deals double Posture damage.
  • Electrical Sensors Your Passive Perception is increased by 10, but you become completely Blinded for 1 turn when you take electric damage.
  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks
  • Water Breath If you are out of water for more than 20 minutes, you start to Suffocate.

Action (2)

  • Constrict Hit +6, Dmg 1d4 strike + 2d4 electric
  • Electric Hit: Any electric damage from this Attack deals double Posture damage.
  • Containment: On a hit, a Medium or smaller creature becomes grappled by you. A creature grappled this way also becomes Contained.
  • You can only grapple 1 creature at once.
  • Bite Hit +6, Dmg 1d6 thrust + 2d4 electric
  • Armor Piercer You ignore 2 AP
  • Electric Hit: Any electric damage from this Attack deals double Posture damage.


Shark

Large, Beast

Tier 2, Challenge Point 4, XP: 8

Attributes

AC 10 AP 0
HP 30 Posture 18
  • Passive Insight/ Perception 26
  • Language None

Movement

Base/ Swim (breath) 30 Climb/Walk 0 Dash 50

Stats + Skills

STR +6 DEX +2 INT -4 WIS +6 CHA -3
  • LU +0: Luck Points: 0; Critical Fail: 1

Ability

  • Blood Frenzy: Once per round, you can Attack 1 target that is Bleeding as a Free Action.
  • Electrical Sensors Your Passive Perception is increased by 10, but you become completely Blinded for 1 turn when you take electric damage.
  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks
  • Water Breath If you are out of water for more than 1 minute, you start to Suffocate.

Actions (1)

  • Bite Hit +6, Dmg 1d12 thrust
  • Bloody Hit: If you deal damage to the HP of a creature, it starts Bleeding (1d6).


Giant Crayfish

Large, Beast

Tier 2, Challenge Point 5, XP: 10

Attributes

AC 7 AP 4
HP 46 Posture 19
  • Passive Insight/ Perception 9
  • Language None

Movement

Base/ Swim (breath) 25 Climb 0 Dash 30

Stats + Skills

STR +6 DEX -1 INT -4 WIS -1 CHA -3
  • LU +0: Luck Points: 0; Critical Fail: 1

Ability

  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks

Action (2)

  • Claws Hit +6, Dmg 1d10 strike or thrust
  • Grapple On a hit, the target becomes grappled if it is Medium or smaller sized. You can grapple up to 2 Medium or smaller creatures at once.
  • Tail Strike Hit +6, Dmg 1d10 strike
  • Water Bash: On a hit, a creature is pushed 10 feet away from you while underwater and take extra 1d10 strike damage. This Attack deal double Posture damage.


Piranha

Tiny, Beast

Tier 2, Challenge Point 1, XP: 2

Attributes

AC 14 AP 0
HP 1 Posture 7
  • Passive Insight/ Perception 16
  • Language None

Movement

Base/ Swim (breath) 35 Climb/Walk 0 Dash 20

Stats + Skills

STR -1 DEX +6 INT -4 WIS +6 CHA -3
  • LU +0: Luck Points: 0; Critical Fail: 1

Ability

  • Blood Frenzy: Once per round, you can Attack 1 target that is Bleeding as a Free Action.
  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks
  • Too Small A Small or larger creature has disadvantage on all Attacks against you.
  • Water Breath If you are out of water for more than 1 minute, you start to Suffocate.

Actions (1)

  • Bite Hit +6, Dmg 1d4 thrust
  • Bloody Hit: If you deal damage to the HP of a creature, it starts Bleeding (1d6).

Reaction

  • Blood Feast As a Reaction, you can make 1 Attack when a creature takes bleed damage.


Piranha Swarm

Tiny, Beast

Tier 2, Challenge Point 8, XP: 16

Attributes

AC 14 AP 0
HP - Posture 30
  • Passive Insight/ Perception 16
  • Language None

Movement

Base/ Swim (breath) 35 Climb/Walk 0 Dash 20

Stats + Skills

STR -1 DEX +6 INT -4 WIS +6 CHA -3
  • LU +0: Luck Points: 0; Critical Fail: 1

Ability

  • Blood Frenzy: Once per round, you can Attack 1 target that is Bleeding as a Free Action.
  • Swarm The amount of Posture determines the number of creatures in the swarm. For each 10 Posture lost, the swarm loses 1 Action and 1 Reaction it can take during its turn.
  • In addition, the swarm makes all Agility Saves with disadvantage, and if it takes any damage in an area, it doubles that damage. Once its Posture reaches 0, the swarm ends and becomes 1d4 Piranhas with 0 Posture.
  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks
  • Too Small A Small or larger creature has disadvantage on all Attacks against you.
  • Water Breath If you are out of water for more than 1 minute, you start to Suffocate.

Actions (3)

  • Bite Hit +6, Dmg 1d4 thrust
  • Light Attack: You make 2 Attacks. If the first Attack was with advantage or disadvantage, the second Attack gains the same advantage or disadvantage.
  • Bloody Hit: If you deal damage to the HP of a creature, it starts Bleeding (1d6).

Reaction (3)

  • Blood Feast As a Reaction, you can make 1 Attack when a creature takes bleed damage.

Tier 3



Killer Whale

Enormous, Beast

Tier 3, Challenge Point 17, XP: 51

Attributes

AC 11 AP 3
HP 146 Posture 75
  • Passive Insight/ Perception 17
  • Senses Blindsenses
  • Language Whale Language

Movement

Base/ Swim 35 Climb/Walk 0 Dash 20

Stats + Skills

STR +10 DEX +3 INT +1 WIS +7 CHA +2
  • LU +0: Luck Points: 0; Critical Fail: 1

Ability

  • Echolocation You lose Blind Senses and become completely Blinded while Deafened.
  • Tracker You gain advantage on Nature Checks
  • Pack Hunter You gain advantage on Attacks if there's an ally within 5 feet of the target you're attacking.
  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks
  • Hold Breath You can hold breath for 10 minutes

Actions (2)

  • Bite Hit +10, Dmg 2d12 thrust
  • Armor Piercer: You ignore 3 AP
  • Tail Hit +10, Dmg 1d10 strike
  • Water Bash: On a hit, a creature is pushed 20 feet away from you while underwater and take extra 1d10 strike damage. This Attack deal double Posture damage.


Giant Crab

Enormous, Beast

Tier 3, Challenge Point 7, XP: 21

Attributes

AC 8 AP 4
HP 66 Posture 26
  • Passive Insight/ Perception 8
  • Language None

Movement

Base/ Swim (breath) 25 Climb 0 Dash 30

Stats + Skills

STR +10 DEX -2 INT -4 WIS -2 CHA -3
  • LU +0: Luck Points: 0; Critical Fail: 1

Ability

  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks

Action (2)

  • Claws Hit +10, Dmg 2d12 strike
  • Grapple On a hit, the target becomes grappled if it is Large or smaller sized. You can grapple up to 2 Large or smaller creatures at once.
  • Water Jet All creatures in a 15 feet wide and 30 feet long area in front of you must then make an Agility Save (DC 18). On a fail, they take 4d8 strike damage and become Knocked Prone. On a success, they only take half that damage. This strike damage deals double Posture damage.
  • Triumph: This Action has a limit of once per round.


Whale

Gigantic, Beast

Tier 3, Challenge Point 20, XP: 60

Attributes

AC 5 AP 5
HP 210 Posture 107
  • Passive Insight/ Perception 17
  • Senses Blindsenses
  • Language Whale Language

Movement

Base/ Swim 35 Climb/ Walk 0 Dash 50

Stats + Skills

STR +10 DEX -3 INT +1 WIS +7 CHA +1
  • LU +0: Luck Points: 0; Critical Fail: 1

Ability

  • Echolocation You lose Blind Senses and become completely Blinded while Deafened.
  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks
  • Hold Breath You can hold breath for 1 hour

Actions (1)

  • Bite Hit +10, Dmg 7d12 thrust
  • Swallow (Concentration): On a hit, the target must succeed on a Brawling Save (DC 18) or be swallowed by you if it’s Large or smaller. While swallowed:
  • • Shares the same space as you.
  • • Is in Full Cover.
  • • Becomes Paralyzed if it has 0 Posture.
  • • Takes 2d8 acid damage at the start of its turns. Any Construct or Armor/Shield/Weapon being used by a creature also takes 1 Corrosion Point when they take this acid damage.
  • You can have 4 creatures swallowed at once, but you vomit if you lose Concentration.

Tier 4



Giant Shark

Enormous, Beast

Tier 4, Challenge Point 40, XP: 160

Attributes

AC 10 AP 4
HP 330 Posture 168
  • Passive Insight/ Perception 28
  • Language None

Movement

Base/ Swim (breath) 30 Climb/Walk 0 Dash 50

Stats + Skills

STR +10 DEX +2 INT -4 WIS +8 CHA -3
  • LU +0: Luck Points: 0; Critical Fail: 1

Ability

  • Blood Frenzy: Once per round, you can Attack 1 target that is Bleeding as a Free Action.
  • Electrical Sensors Your Passive Perception is increased by 10, but you become completely Blinded for 1 turn when you take electric damage.
  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks
  • Water Breath If you are out of water for more than 1 minute, you start to Suffocate.

Actions (2)

  • Bite Hit +10, Dmg 3d12 thrust
  • Armor Piercer: You ignore 3 AP
  • Bloody Hit: If you deal damage to the HP of a creature, it starts Bleeding (1d12).
  • Swallow (Concentration): On a hit, the target must succeed on a Brawling Save (DC 18) or be swallowed by you if it’s Large or smaller. While swallowed:
  • • Shares the same space as you.
  • • Is in Full Cover.
  • • Becomes Paralyzed if it has 0 Posture.
  • • Takes 2d8 acid damage at the start of its turns. Any Construct or Armor/Shield/Weapon being used by a creature also takes 1 Corrosion Point when they take this acid damage.
  • You can have 2 creatures swallowed at once, but you vomit if you lose Concentration.


Sperm Whale

Gigantic, Beast

Tier 4, Challenge Point 40, XP: 160

Attributes

AC 5 AP 5
HP 330 Posture 170
  • Passive Insight/ Perception 20
  • Senses Blindsenses
  • Language Whale Language

Movement

Base/ Swim 35 Climb/ Walk 0 Dash 50

Stats + Skills

STR +10 DEX -3 INT +4 WIS +10 CHA +2
  • LU +0: Luck Points: 0; Critical Fail: 1

Villain Action

  • Ultrasound Wave Sonar Any creature that starts its turn within 60 feet of you must make an Endurance Save (DC 18), taking 2d12 sonic damage on a fail, or half as much on a success.
  • A creature that takes this sonic damage must also make another Endurance Save (DC 18), taking 2d12 fire damage on a fail, or half as much on a success.
  • This fire damage bypasses and resistances, as it burns you from the inside rather than the outside.

Ability

  • Echolocation You lose Blind Senses and become completely Blinded while Deafened.
  • Swimmer You are in harsh terrain while on ground. While underwater, you are considered to be in fast terrain and you don't gain disadvantage on Attacks
  • Hold Breath You can hold breath for 1 hour

Actions (1)

  • Bite Hit +10, Dmg 7d12 thrust
  • Swallow (Concentration): On a hit, the target must succeed on a Brawling Save (DC 18) or be swallowed by you if it’s Large or smaller. While swallowed:
  • • Shares the same space as you.
  • • Is in Full Cover.
  • • Becomes Paralyzed if it has 0 Posture.
  • • Takes 2d8 acid damage at the start of its turns. Any Construct or Armor/Shield/Weapon being used by a creature also takes 1 Corrosion Point when they take this acid damage.
  • You can have 4 creatures swallowed at once, but you vomit if you lose Concentration.