Chaos Rat

Normal Shape. Twice per day, the Chaos Rat can assume the form and abilities of a humanoid creature it has seen recently. It inherits the Strength, Dexterity, and Constitution scores and abilities of the creature. When the Chaos Rat is knocked unconscious or takes lethal damage, it leaves the Normal Shape and receives any excess damage.

Nimble Body. When the Chaos Rat succeeds in a check that would result in receiving reduced damage, it instead receives none.

Nimble Multi-attack. The Chaos Rat makes three bites attacks. After each attack it may choose to move 5 feet in any direction.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 2d6 piercing damage. If the target is a non-mechanical creature, it must succeed on a DC 12 Constitution saving throw or take an additional 2d4 poison damage, and become poisoned for 3 rounds.

Scurry. The Chaos Rat moves 20 feet in any direction. The Chaos Rat may move through creatures of a size larger than small as if they were normal terrain, and creatures moved through this way must succeed on a DC 15 Dexterity saving throw or be knocked prone.

Glare. The Chaos Rat glares at a target, forcing them to make a DC 14 Strength check. If the target fails, it must drop its weapons, and it loses 1d4 to hit on its next attack on the Chaos Rat. If the target succeeds, it loses 1d4 to hit on its next attack against the Chaos Rat.

Chaotic Prescence (3/day). Whenever a spell of level 3 or lower is cast against the Chaos Rat, it may use its reaction to cast a copy of that spell against its source. The Chaos Rat inherits the relevant modifiers and bonuses from the source as well.