Gear
Monsters › Parts of a Stat Block · SRD 5.2.1 p. 255
Monsters have proficiency with their equipment. If a monster has equipment that can be given away or retrieved, the items are listed in the Gear entry. The monster’s stat block might include special flourishes that happen when the monster uses an item, and the stat block might ignore the rules in “Equipment” for that item. When used by someone else, a retrievable item uses its “Equipment” rules, ignoring any special flourishes in the stat block.
The Gear entry doesn’t necessarily list all of a monster’s equipment. For example, a monster that wears clothes is assumed to be dressed appropriately, and those clothes aren’t in this entry.
Equipment mentioned outside the Gear entry is considered to be supernatural or highly specialized, and it is unusable when the monster is defeated.
Ammunition and Ranged Attacks
A monster that requires ammunition to make ranged attacks carries the necessary ammunition.
Equipping a Monster with Other Items
You may equip monsters with additional gear however you like, using the items in “Equipment” for inspiration. You decide how much of a monster’s equipment is recoverable after the creature is slain and whether any of that equipment is still usable.
Beware of giving a monster combat-oriented magic items, since those might alter the monster’s Challenge Rating. If you do give a monster a magic item, the monster can have Attunement with magic items as noted in “Equipment.” A monster with a class tag after its creature type is considered a member of that class for Attunement purposes.