IADnDMN Stream Monsters! (2019/04/19)

Wasp Snail

Suggested by ALL OF REDDIT https://redd.it/beolcj.

One of the more whimsical creatures native to the feywild, Wasp Snails are a species of snail that has developed a symbiotic relationship with one of their world's many native wasp species.

image source: this reddit post.

Royal Rat Authority

Gargantuan monstrosity, neutral evil

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Armor Class 14 (natural armor)
Hit Points 116 (8d20 + 32)
Speed 50 ft.

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STR	DEX	CON	INT	WIS	CHA
18 (+4)	14 (+2)	19 (+4)	6 (-2)	13 (+1)	8 (-1)

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Saving Throws Str +7, Dex +5, Wis +4
Skills Perception +4
Damage Resistance acid
Damage Immunities poison
Condition Immunities petrified, poisoned
Senses darkvision 60 ft., passive Perception 14
Languages —
Challenge 8 (3,900 XP)

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Keen Smell. The rat has advantage on Wisdom (Perception) checks that rely on smell.

Pack Tactics. The rat has advantage on an attack roll against a creature if at least one of the rat's allies is within 5 feet of the creature and the ally isn't incapacitated.

Rat Telepathy (Recharge 5–6). The rat can telepathically communicate simple ideas and commands to rats it can see within 60 feet of it. As a bonus action, the rat can issue a command to each other rat of its choice in this radius, allowing them to either move up to their speed, or make a single melee attack against a creature within its reach. Alternatively, the rat can use its action to summon forth 1d4 + 1 Giant Rats to its aid.

Actions

Multiattack. The rat makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 18 (4d6 + 4) piercing damage.

Claws. Melee Weapon Attack: +7 to hit, reach 15 ft., one target. Hit: 16 (5d4 + 4) slashing damage.

Acid Surge (1/Day). The rat vomits forth a surge of acid, filling a 20-foot cube. Each creature in the area must make a DC 15 Dexterity saving throw, taking 15 (6d4) acid damage on a failed save or half as much on a successful one. Any nonmagical metal armor or a metal shield being worn or carried by a creature that fails its save takes a permanent and cumulative −1 penalty to the AC it offers. Armor reduced to an AC of 10 or a shield that drops to a +0 bonus is destroyed.
    Additionally, pools of acid form on the ground in the area. A creature that enters the area for the first time on its turn, or that ends its turn there suffers 7 (3d4) acid damage, and suffers the same corrosion penalty to its armor.

Recursive Devourer

Huge aberration, chaotic evil

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Armor Class 15 (natural armor)
Hit Points 184 (16d12 + 80)
Speed 15 ft., climb 15 ft., fly 40 ft.

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STR	DEX	CON	INT	WIS	CHA
20 (+5)	16 (+3)	21 (+5)	3 (-4)	12 (+1)	7 (-2)

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Saving Throws Str +10, Wis +6, Cha +3
Skills Perception +6
Damage Resistances poison
Condition Immunities blinded, charmed, poisoned
Senses blindsight 60 ft. (blind beyond this radius), passive Perception 16
Languages —
Challenge 16 (15,000 XP)

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Demiplanar Bowels. Any creature or object that the devourer swallows is transported to a demiplane that can be entered by no other means except a wish spell or by using magic that enables planar travel, such as the plane shift spell. A creature can leave the demiplane only by using such magic. The demiplane resembles a stone cave roughly 1,000 feet in diameter with a ceiling 100 feet high, in which resides another recursive devourer. Additionally, like a stomach, the demiplane contains the remains of the devourer’s past meals. The devourer can't be harmed from within the demiplane inside it. If the devourer dies, the demiplane disappears, and everything inside it appears around the corpse. The demiplane is otherwise indestructible.

Demiplanar Recursion. Each devourer's demiplanar bowels is home to a lesser version of itself. Each lesser version can potentially swallow targets still, sending them into yet another set of demiplanar bowels, yet containing another devourer, and so on. Each successive devourer's hit point maximum is equal to half the hit point maximum of its parent devourer (minimum 1 hit point). If any lesser devourer is killed,

the demiplanar bowels in which it resided collapse, sending all contents to the spaces around its parent devourer. That parent devourer can then no longer swallow creatures until it completes a long rest.

Alcoholic Susceptibility. Whenever a creature under the effects of alcohol intoxication deals damage to the devourer while within 15 feet of it, the devourer suffers an amount of psychic damage equal to the damage dealt.

Immutable Form. The devourer is immune to any spell or effect that would alter its form.

Actions

Multiattack. The devourer makes two attacks: one with its bite and one with its tail.

Bite. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 24 (3d12 + 5) piercing damage. If the target is a Large or smaller creature, it must succeed on a DC 15 Dexterity saving throw or be swallowed by the devourer. The swallowed target, along with everything it is wearing and carrying, appears prone in an unoccupied space on the floor of the devourer’s Demiplanar Bowels.

Tail. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 15 (3d6 + 5) bludgeoning damage.

Legendary Actions

The devourer can take 3 legendary actions, choosing from the options below. Only one legendary option can be used at a time and only at the end of another creature’s turn. The devourer regains spent legendary actions at the start of its turn.

Tail. The devourer makes an attack with its tail.
Evasive Maneuver. The devourer flies up to half its speed, not provoking opportunity attacks.
Tar Spit (Costs 2 Actions). Ranged Weapon Attack: +9 to hit, range 20/60 ft., one target. Hit: The target is restrained until it or a creature within 5 feet of it uses an action to make a successful DC 15 Strength (Athletics) check to free it.