n huge aquatic elemental water 

Perception +22; darkvision

Languages Aquan

Skills Athletics +23, Stealth +23

Str +6 Dex +6 Con +6 Int +0 Wis +3 Cha +0

Water-Bound When not touching water, the living waterfall is slowed 1 and can't use reactions.

AC  31; Fort +21, Ref +22, Will +19

HP 195; Immunities bleed, poison, paralyzed, sleep; Resistances fire 10

Vortex (aura, water) 30 feet. Water in the area that is in the same body of water as the living waterfall is difficult terrain for Swimming creatures that don't have the water trait.

Speed 35 feet, swim 100 feet

Melee [>] wave +24 (reach 20 feet), Damage 2d12+12 bludgeoning plus Push or Pull 10 feet

Drench [>] (abjuration, primal, water) The elemental puts out all fires in a 20-foot emanation. It extinguishes all non-magical fires automatically and attempts to counteract magical fires (+20 counteract modifier).

Surge [>>] The elemental tsunami quickly expands its space to fill the area of its vortex. Creatures within the vortex's emanation take 5d12+6 bludgeoning damage (DC 31 basic Fortitude save). A creature that fails this save is Pushed 20 feet. The elemental tsunami then retracts to its former space. The elemental tsunami can't Surge again for 1d4 rounds.

Bestiary, page 153. Expanded in LOIL.