Actions

Multiattack. The derro hulk makes two smash attacks. Fury: it can replace one of these attacks with a Yeet attack.   Smash. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 21 (4d6 + 7) bludgeoning damage. Fury: if the attack hits, the target is also grappled.   Yeet (Fury only). If the derro hulk is grappling a Medium or smaller creature, it can throw it at another target. Make a Ranged Attack: +10 to hit, range 20ft., one target. Hit: 18 (3d6 + 7) bludgeoning damage. Both the hit and the thrown creature take this damage if the attack hits. On a miss, the thrown creature suffers half the damage of a hit.   Insanity leap (Recharge 6). The derro hulk jumps up to double its movement speed and makes a Melee Weapon Attack: +10 to hit, reach 5ft., one target. Hit: 27 (8d4 + 7) bludgeoning damage. If the target is a Large or smaller creature, it must make a DC 16 strength saving throw. On a failed save the target is knocked prone and the derro hunter can make a free smash attack.

Reactions

Fury. After losing half of his HP, the derro hulk gets stronger in its fury. It can grapple and throw creatures its size or smaller. This condition ends after the derro hulk is fully healed. It also gains resistance to Bludgeoning, Slashing and Piercing damage.

Suggested Environments

Deeps of the Underdark, preferably in a warmer part like near a magma lake.