Oversized
When a club the size of a tree hits a party member like a truck. When a giant's great-axe cleaves through houses and guards like a sharpened wrecking ball. When an artificer doesn't want to just tote a gun around, they want a whole cannon.
Oversized Rules passively exist for Large and larger creatures written in sections of the MM and the DMG. A Large character and the equipment they can tote can exceedingly have difficulty maneuvering their environment, but also can present instances of abusing or exceeding damage capabilities PCs normally cap off by the available weapons they can purchase or acquire.
This Zee Bashew Video honestly presents everything to consider about the Oversized Rule and Large Player Character information and issues: Why no Large Characters? D&D5e https://youtu.be/1rW9nDkNqhY
Oversized Weapons
A weapon with the oversized property is an intermediate step between the weapons in the PHB and Large-Sized Weapons. The intent for this ruling is for use by Large-Sized Player Characters, with an intended weapon damage increase, but not an overwhelmingly overpowered increase in damage.
The Oversized Property can be applied to the Statistics of any Melee Weapon. The Oversized Property can only be applied once, and these rulesets only support Medium to Large Oversized Player Character rules. An Oversized Weapon deals an increased damage dice greater than its original counterpart.
- 1d4 > 1d6 > 1d8 > 1d10 > 1d12 > 2d8
- 2d4 > 2d6 > 2d8
An Oversized Weapon costs double the amount of its normal counterpart, and it weighs double the normal amount as well.
Oversized Weapon Properties
- Light. The weapon is only considered a light weapon if you are a Large creature, otherwise it is ignored.
- Finesse. The weapon is only considered finesse if you are a Large creature, otherwise it is ignored.
- Versatile. The weapon is only considered versatile if you are a Large creature, otherwise it is considered as a two-handed weapon.
- Heavy. If you are a Medium creature, you have disadvantage on attack rolls with the weapon unless you match the Strength Score Requirement (which is typically 19). If you are a Small creature, you cannot wield the weapon at all and are unable to make attacks with it.
- Thrown. You can only throw the weapon if you are a Large creature.
- Two-Handed. Add the Heavy property if the weapon did not already have it.
The Oversized / Large Trait RAW
Oversized Weapons
PG 278 DMG
Big monsters typically wield oversized weapons that deal extra dice of damage on a hit. Double the weapon dice if the creature is Large, triple the weapon dice if it's Huge, and quadruple the weapon dice if it's Gargantuan. For example, a Huge giant wielding an appropriately sized greataxe deals 3d12 slashing damage (plus its Strength bonus), instead of the normal 1d12.
Barding / Oversized Armor
PG 155 PHB
Barding is armor designed to protect an animal's head, neck, chest, and body. Any type of armor shown on the Armor table in this chapter can be purchased as barding. The cost is four times the equivalent armor made for humanoids, and it weighs twice as much.
Oversized Unarmed Strikes
A Large Creature who makes an attack with an Unarmed Strike deals 2d4 Bludgeoning damage on a hit. If a Large Creature already has Natural Weapons they use to make Unarmed Strikes with, they may increase the Damage dice of it instead as read in "Oversized Weapons".
Large Weapons from RAW
Large weapons deal double the damage dice (e.g. a Large shortsword deals 2d6 damage). Note that this rule is buried away in the "Creating a Monster" chapter of the DMG, and not the PHB. This rule is a guide to help a DM create monsters, so the DM should not feel obligated to allow the same rule to apply to PCs. Nonetheless, a DM might allow a PC to wield a Large weapon as-is; or allow them to wield it with disadvantage on attack rolls (as though it were Heavy for them).
Examples
- Greatspear (Oversized Spear). 2gp, 6lb - 1d8 P, Thrown 20/60, Versatile 1d10
- Buster Sword/Zweihander (Oversized Greatsword). 100gp, 12 lb. - 2d8 S, Heavy, Two-Handed
- Shortsword (Oversized Dagger). 4 gp, 2 lb. - 1d6 P, Finesse, Light
Oversized Ranged Weapons
These rules don't support Oversized Ranged Weapons, but would probably simulate something close to the Oversizd Longbow Equipment, carrying a Ballista for a wepaon, or a Handheld Cannon.