Homebrew

Traits

Magic Resistance. The corrupted bear has advantage on saving throws against spells and other magical effects.   Aura of Corruption. A deadly aura of corruption surrounds the bear. Trigger: Any creature within 10 feet of the bear at the start of its turn. Saving Throw: DC 10 Constitution. On Failure: 2d6+2 necrotic damage. On Success: half damage.   Unnatural Vitality. The corrupted bear heals 10 hit points at the start of its turn if it has at least 1 hit point remaining. This ability doesn't function if the corrupted bear is exposed to sunlight.

Actions

Multiattack. The bear makes three Bite attacks. It can replace one attack with Corrupted Roar if available.   Bite. Melee Weapon Attack: 1d20+11 to hit, reach 5 ft., one target. Hit: 20 ( 2d12+7 ) piercing damage plus 11 ( 2d10 ) necrotic damage. The bite may cause Tarika's Hunger and turn the target into a werebear. Constitution saving throw DC 10 to resist.   Corrupted Roar (Recharge 1d6>=5 ). The corrupted bear lets out a terrifying, corrupted roar. Each creature within 6 square of the bear that can hear it must make a DC 14 Wisdom saving throw or be frightened for 1 minute. A frightened creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Reactions

Corrupted Slash. Melee Weapon Attack: 1d20+11 to hit, reach 10 ft., one creature attacking the bear. Hit: 22 ( 4d10 ) necrotic damage, and the target must succeed on a DC 15 Constitution saving throw or the attack fails and has no effect.