Sleeping with the Fishes

Lurking under the water, the Sea Hag waits for what can only be the final encounter.
She had grossly misjudged the strength of the adventurers. The Elven Cleric had somehow managed to resist the song of her ‘daughters’ and blasted her precious plans apart.
Many of her daughters are dead and despite being air-breathers, the adventurers have pursued her into the underwater caves.
Still, she can’t leave, so it’s going to be a fight to the death.