Bugbear Pumpkinhead

Berserk. Whenever the bugbear pumpkinhead starts its turn with 40 hit points or fewer, roll a d6. On a 6, the bugbear pumpkinhead goes berserk. On each of its turns while berserk, the bugbear pumpkinhead attacks the nearest creature it can see. If no creature is near enough to move to and attack, the bugbear pumpkinhead attacks an object, with preference for an object smaller than itself. Once the bugbear pumpkinhead goes berserk, it continues to do so until it is destroyed or regains all its hit points.

Aversion to Fire. If the bugbear pumpkinhead takes fire damage, it has disadvantage on attack rolls and ability checks until the end of its next turn.

Immutable Form. The bugbear pumpkinhead is immune to any spell or effect that would alter its form.

Lightning Absorption. Whenever the bugbear pumpkinhead is subjected to lightning damage, it takes no damage and instead regains a number of hit points equal to the lightning damage dealt.

Magic Resistance. The bugbear pumpkinhead has advantage on saving throws against spells and other magical effects.

Magic Weapons. The bugbear pumpkinhead weapon attacks are magical.

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

Surprise Attack. If the bugbear pumpkinhead 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.

Padded Feet. The bugbear pumpkinhead has advantage on Dexterity (Stealth) checks to move silently.

Multiattack. The bugbear pumpkinhead makes two slam attacks.

Slam. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 15 (3d8 + 5) bludgeoning damage.