Armor Class 17 (natural armor)
Hit Points 117 (18d8 + 36)
Speed 30 ft.
Saving Throws WIS +8, CHA +4
Skills Arcana +4, Medicine +8, Nature +4, Survival +8
Senses passive Perception 15
Languages Aquan, Common, Draconic
Challenge 6
Hold Breath. Krull can hold his breath for 1 hour.
Inescapable Destruction. Necrotic damage dealt by Krull's spells ignores resistance to necrotic damage.
Claws. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 7 (1d4 + 5) piercing damage.
+1 Maul. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) bludgeoning damage plus 9 (2d8) necrotic damage.
Shell Defense. Krull withdraws into his shell. Until he emerges as a bonus action, he has a +4 bonus to AC and has advantage on Strength and Constitution saving throws. While in his shell, Krull is prone, his speed is 0 and can't increase, he has disadvantage on Dexterity saving throws, he can't take reactions, and the only action he can take is to emerge from his shell.
BGDIA, p. 110