Bugbear Matriarch

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

Heart of Stone. The bugbear has advantage on saving throws against being charmed, frightened, paralyzed, poisoned, stunned, or put to sleep.

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.

Big Hands, Strong Grip. The bugbear has large and strong hands enabling her to wield two-handed weapons with one hand.

Innate Spellcasting. The bugbear matriarch's innate spellcasting ability is Charisma (spell save DC 15). She can innately cast the following spells, requiring no material components:
At will: alter self, invisibility, lightning lure
3/day each: darkness, dimension door, haste

Multiaction. The bugbear can make one melee attack and cast one spell or make two melee attacks.

Spiked Club Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 13 (2d10 + 2) piercing damage.