Venomfist

Constant Spells — A constant spell affects the monster without the monster needing to cast it, and its duration is unlimited. If a constant spell gets counteracted, the monster can reactivate it by spending the normal spellcasting actions the spell requires.

Toxic Downpour (aura, primal) — Venomfist's presence alters the weather within 2 miles to heavy rainfall as long as they're located in a sizable body of water. When they become hostile, the rain in a 120-foot emanation from them becomes highly toxic and deals 8d8 poison damage (DC 42 Fortitude half) to all creatures in the area.

Vortex (aura, water) — 120 feet. Water in the area that is in the same body of water as Venomfist is difficult terrain for Swimming creatures that don't have the water trait.

Constrict — 4d6 bludgeoning plus 4d6 poison, DC 45 Fortitude
The monster deals the listed amount of damage to any number of creatures Grabbed or Restrained by it. Each of those creatures can attempt a basic Fortitude save with the listed DC.

Create Poison — Frequency once per day
Effect Venomfist transforms a portion of their watery body into a single dose of any type of common poison of 20th level or lower—tears of death is their favorite. If they're holding a container, they can create the poison within that container, at which point the poison remains viable for 24 hours before it reverts to water. Alternatively, they can apply a contact or injury-created poison to their fist.

Surge — Venomfist expands their space to fill the area of their vortex. Creatures within the aura take 6d12+6 bludgeoning plus 6d12+6 poison{6d12+6 bludgeoning and 6d12+6 poison} damage with a DC 45 Fortitude save. A creature that fails this save is pushed 40 feet. Venomfist then retracts to their former space and cannot use Surge again for 1d4 rounds.

Improved Grab —