Some of the NPCs in Out of the Abyss are a little unique and I ended up doing quick conversions to have the right statblock on hand for my players. Here is the Prince.
Medium humanoid (quaggoth), chaotic neutral
Armour Class 13 (natural armour)
Hit Points 45 (6d8 + 18)
Speed 30ft., climb 30ft.
|17 (+3)||12 (+1)||16 (+3)||6 (-2)||12 (+1)||7 (-2)|
Skills Athletics +5
Damage Immunities poison
Condition Immunities poisoned
Senses darkvision 120ft., passive Perception 10
Challenge 2 (450 XP)
Mr Hyde. Whenever Prince Derendil enters combat and every round thereafter he must make a DC 10 Charisma saving throw or fly into a rage. He gains the benefit of wounded fury for the duration of the affect. Once all enemies are killed he may make another saving throw to end the rage, if he does not, he attacks the nearest creature (friend or foe). An ally may “talk him down” by making a DC 10 Charisma (Persuasion) check. The DC for this check may increase depending on the situation.
Wounded Fury. While Prince Derendil has 10 hit points or fewer, he has advantage on attack rolls. In addition, he deals an extra 7 (2d6) damage to any target he hits with a melee attack.
Multiattack. Prince Derendil makes two claw attacks or one drowrought dagger attack.
Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one target.
Hit: 6 (1d6 + 3) slashing damage.
Drowrought Dagger. Melee Weapon Attack: +5 to hit, reach 5 ft., one target.
Hit: 3 (1d4 + 1) piercing damage.
This hulking quaggoth is the most menacing-looking prisoner in the slave pens, and the other prisoners give him a wide berth. When you dared to speak to him, however, the quaggoth replies in urbane Elvish. He explains that he is not, in fact, a quaggoth, but a gold elf prince polymorphed into quaggoth form by a curse. He claims to be Prince Derendil of the kingdom of Nelrindenvane in the High Forest. His crown was usurped by the evil wizard Terrestor, who trapped him in this form and exiled him from his people. Although Derendil behaves like the highborn prince he believes himself to be, he responds to stress-and particularly threats-like a quaggoth: violently tearing foes limb from limb and rending their flesh with sharp claws and teeth. You have learned that he only comes back to himself after battle, or when someone reinforces his “true identity” to snap him out of it. Derendil laments that he is slowly but surely losing himself to the savagery of his quaggoth form.