Undine
Former Champion of Water
Undine was Champion of Water during the Planar War. Aquella's account tells how the Water Elves built the Drowning Machine against a colossal Darkness Elemental. When its first attack failed to kill the creature, Undine gave her mind, body and soul to its pedestal. The currents tore the Elemental in two, but Undine's soul was erased as the weapon's price.
Sources
Abyssal Zone murals · Muusa's account · Voice in the Sea lore