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by Sheldon Morris

Large monstrosity, chaotic evil
Armour Class 13
Hit Points 119 (14d10 + 42)
Speed 30 ft., swim 50 ft.
17 (+3)|16 (+3)|17 (+3)|9 (-1)|12 (+1)|12 (+1)
Saving Throws Con +6, Cha +4
Skills Perception +4, Survival +4, Intimidation +4
Damage Immunities fire, poison
Condition Immunities poisoned
Senses passive Perception 14
Languages Deep Speech, Sylvan
Challenge 7 (2,900 XP)

Amphibious. The nuckalavee can breath air and water.

Fear Aura. Any creature hostile to the nuckalavee that starts its turn within 50 feet of the nuckalavee must make a DC 14 Wisdom saving throw, unless the nuckalavee is incapacitated. On a failed save, the creature drops whatever it is holding and is frightened as by a fear spell. If a creature's saving throw is successful, the creature is immune to the nuckalavee's Fear Aura for the next 24 hours.

Pernicious Presence. Every normal insect and creature with 2 hit points or less that is within 120 feet of the nuckalavee is reduced to 0 hit points. A creature that has greater than 2 hit points will be affected by a slight, sickly naucious feeling, but has no other negative effect.

Vulnerable to Running Water. Running water is difficult terrain for a nuckalavee and immediately gains one level of exhaustion when it enters running water. The nuckalavee takes 20 acid damage and gains one level of exhaustion if it ends its turn in running water.

Regeneration. The nuckalavee regains 10 hit points at the start of its turn if it has at least 1 hit point and isn't in running water.

Multiattack. The nuckalavee attacks with two claw attacks. When its cold breath is available, it can use the breath in place of a claw attack.

Claws. Melee Weapon Attack: +6 to hit, reach 5 ft., one target.
Hit: 16 (3d8 + 3) slashing damage, The target must succeed on a DC 14 Constitution saving throw or become poisoned. While poisoned in this way, the target can't regain hit points, and it takes 7 (2d6) poison damage at the start of each of its turns. The poisoned target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Cold Breath (Recharge 5-6). The nuckalavee exhales an icy blast in a 60-foot line that is 5 feet wide. Each creature in that line must make a DC 15 Constitution saving throw, taking 52 (8d12) cold damage on a failed save, or half as much damage on a successful one.