Bugbear Clawstriker

Brute. A melee weapon deals one extra die of its damage when the bugbear hits with it (included in the attack).

Surprise Attack. If the bugbear surprises a creature and hits it with an attack during the first round of combat, the target takes an extra 7 (2d6) damage from the attack.

Multiattack. The bugbear makes four claw attacks.

Claws. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 2) slashing damage.

Ferocious. When a creature ends its turn within 5 feet of the bugbear, it can use its reaction to make a melee attack against that creature.