Chaos Owlbear

Keen Sight and Smell. The owlbear has advantage on Wisdom (Perception) checks that rely on sight or smell.

Legendary Resistance (1x/Day). If the owlbear fails a saving throw, it can choose to succeed instead.

Magic Infused Strikes. When the owlbear hits with an attack, roll a d8 and an additional damage die for the attack. The number on the d8 determines the type of damage that the additional damage die deals according to the table below. The damage type remains active until another attack is made with that appendage.

Unstable Magic. When the owlbear drops below 70 HP, each time it is hit with an attack a burst of magical energy damages those around it. Any creature within 5 ft of the owlbear when it takes damage takes 1d6 of one of the active damage types.

Multiattack. The owlbear makes three attacks: one with its beak and two with its claws.

Beak. Melee Weapon Attack: +10 to hit, reach 5 ft., one creature. Hit: 11 (1d10 + 6) piercing damage.

Claws. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 15 (2d8 + 6) slashing damage.

Damage Absorption. When the owlbear takes damage of the same type as one of its active damage types, it can use its reaction to gain immunity to that instance of damage and instead heal the amount of damage it would have taken.

The owlbear can take 1 legendary action, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The owlbear regains spent legendary actions at the start of its turn.

Claw. The owlbear makes one claw attack.

Barreling Charge. The owlbear travels its speed in a straight line. Any other creature in its path must succeed on a DC 15 Strength saving throw or be pushed 5 feet and be knocked prone.