Chaos Monkey

Chaos Incarnate. Chaos Monkeys are innately tapped into the chaos of the universe. Due to this all interactions with them can be widely unpredictable. ALL interactions that require a d20 roll also require chaos rolls by the DM or player as stated below:

Non-combat interactions. After all interactions that require d20 skills checks, the player rolls a d6. On a 1-3 - skill check roll result stands as rolled. On a 4-6 - skill check roll result is reversed

Combat interactions. After all attack rolls against chaos monkeys, the DM rolls a d6. If the attack roll was successful the following applies: On a 1-2 - attack roll remains as rolled, on a 3-4 - attack roll fails, on a 5 - attack damage is doubled against chaos monkey, on a 6 - damage is transferred to an ally of attacker as determined by a roll by DM

Multiattack. The chaos monkey makes two random weapon attacks.  At beginning of attack, DM rolls a d6 and a weapon appears in the chaos monkeys hands based on the following: On a 1-2 - a longsword appears, on a 3-4 - a battleaxe appears, on a 5-6 - nothing appears and the chaos monkey uses its fists. The chaos monkey is proficient in the use of the weapon.

Random Weapon. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 13 (1d6 + 9) bludgeoning damage or Hit: 15 (1d10 + 9) slashing damage or Hit: 14 (1d8 + 9) slashing damage

Call the Troop. After d6 rounds, and only 1/combat, a chaos monkey can call out to its troop members across the multiverse. DM rolls a d6 and a certain number of chaos monkeys will appear based on the follow: On a 1 - 0 chaos monkeys appear, on a 2-4 - 1 chaos monkey appears, on a 5-6 - 2 chaos monkeys appear. All called chaos monkeys make an initiative roll upon arrival. Called chaos monkeys can not use this feature for d6 rounds.

Resistance Gamble. Once per turn as a reaction to an attack, a chaos monkey reacts to the damage type of the attack as per a d6 roll by the DM as follows: On a 1-2 - the chaos monkey is affected normally, on a 3-4 - the chaos monkey is resistant, on a 5 - the chaos monkey is immune, on a 6 - the chaos monkey is vulnerable

Death means nothing. When a chaos monkey is reduced to 0 hit points, the DM rolls a d6 and the following applies: On a 1-2 - the chaos monkey dies, on a 3-4 - the chaos monkey's chaos energy explodes. All creatures within 30 ft must make a DC 18 DEX save and take 2d10 force damage upon a failure or half as much on a success, on a 5-6 - the monkey's chaos energy swirls around and it is reborn as a Chaos Ape