Multiattack

Two Tainted Claw or Poisonous Water Jet attacks.

Tainted Claw

Melee Weapon Attack: +6 to hit, 5 ft., one target, 6 (1d6+3) slashing damage + 9 (2d8) poison and target poisoned 1 min (DC 15 Con negates poison). A poisoned creature can re-save at end of each of its turns success ends effect on itself.

Poisonous Water Jet

Ranged Spell Attack: +5 to hit, 60 ft., one target, 15 (3d8+2) poison.

Enter Reflection

Touches a body of water large enough to hold it and becomes a reflection on water's surface. While in this form has immunity to B/P/S damage from nonmagical attacks and resistance to B/P/S from magical attacks. While a reflection speed is 5 ft. can't use Tainted Claw and can revert to its true form as a bonus action. If it takes damage that isn't bludgeoning piercing or slashing while a reflection forced back into its true form.