Npc: Atavist

Malleable Physiology. At the start of its turn the atavist gains one of the following benefits until it ends the effect (no action required) or the start of its next turn:Darkvision out to a range of 30 feet.A climbing flying or swimming speed of 30 feet.Advantage on Wis (Perception) checks that rely on hearing or smell.Bony spikes sprout along its skin and a creature that touches the atavist or hits it with melee attack while within 5 ft. of it takes 4 (1d8) piercing damage.

Multiattack. Two Keratin Blade or Bone Shard attacks. If both attacks hit one target the target takes an extra 7 (2d6) piercing damage as bits of bone dig deeper into the target.

Keratin Blade. Melee Weapon Attack: +6 to hit, 5 ft., one target, 11 (2d6+4) slashing damage.

Bone Shard. Ranged Weapon Attack: +4 to hit 30/120' one target 7 (2d4+2) piercing damage.