SRD + Homebrew
Clockwork Owlbear CR: 4
Large construct, monstrosity, unaligned
Armor Class: 14 (natural armor)
Hit Points: 61 8d10+21
Speed:
40 ft
, swim: 20 ft
, climb: 10 ft
Skills: Perception 1d20+3
Damage Immunities: psionic, psychic
Condition Immunities: charmed, exhausted, frightened, paralyzed, petrified, poisoned
Senses: darkvision 60 ft, passive Perception 13
Challenge Rating: 4
Keen Sight and Smell.
The owlbear has advantage on Wisdom (Perception) checks that rely on sight or smell. 2d20k1+3
Self-repair.
The Clockwork Owlbear can use a nearby source of Iron, Copper, or other strong metal to reconstruct itself and regain hitpoints. It can use its action to consume up to 2 pounds of metal and heal 1d6 per pound consumed.
Actions
Multiattack.
The owlbear makes two attacks: one with its beak and one with its claws.
Beak.
Melee Weapon Attack: 1d20+7 to hit, reach 5 ft., one target. Hit: 10 1d20+5 piercing damage.
Claws.
Melee Weapon Attack: 1d20+7 to hit, reach 5 ft., one target. Hit: 14 2d8+5 slashing damage.