Bugbear Blood Ghost Berserker

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

Reckless. At the start of its turn, the bugbear can gain advantage on all melee weapon attack rolls during that turn, but attack rolls against it have advantage until the start of its next turn.

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.

Thick Hide. The bugbear adds its Constitution modifier to its armor class (included above).

Multiattack. The bugbear uses Bloodcurdling Howl if it is available, then makes one greataxe attack.

Greataxe. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 17 (2d12 + 4) slashing damage.

Bloodcurdling Howl (Recharge 5-6). The bugbear lets out a horrifying battle cry laced with supernatural power. Each creature that is within 120 feet of the bugbear and aware of it must succeed on a DC 14 Wisdom saving throw or become frightened for 1 minute.  A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature’s saving throw is successful or the effect ends for it, the creature is immune to the Bloodcurdling Howl of all Blood Ghost Berserkers for the next 24 hours.