Bugbear Beast Shaman

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

Spellcasting. The bugbear is a 7th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 13, +5 to hit with spell attacks). It has the following druid spells prepared:

Cantrips (at will): druidcraft, poison spray, thorn whip

1st level (4 slots): charm person, entangle, healing word

2nd level (3 slots): heat metal, hold person, spike growth

3rd level (3 slots): conjure animals (wolves), erupting earth, stinking cloud

4th level (1 slot): charm monster

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 two bear claw attacks.

Bear Claw. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 2) piercing damage.

Change Shape (Recharges after a Short or Long Rest). As a bonus action, the bugbear can magically polymorph into a giant wolverine, saber-toothed tiger, or worg alpha, remaining in that form for up to 1 hour. It can revert to its true form as a bonus action. Its statistics, other than its size, are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.

Nature's Fury. When the bugbear casts a druid spell, it can make one bear claw attack as a bonus action.