Yawgoth Spawn
Inspired by the fallen empire of Yawgoth and the Elder God Architeuthis, Jessudu the Sumptuous created a water-construct known as the Yawgoth Spawn.
Using broken shards and potsherds from that empire she spent decades designing and building the sacred jars that are necessary to contain the skins, bones, horns and cartilage needed to reform the Yuggoth Spawn each time it is created. The columns through her coral palace contained the sigils to reconstitute the Yuggoth Spawn each time. Incredible force of will was required to hold it together otherwise it would breakinto millions of pieces and dissolves back into the ocean.
Jessudu was working towards the spawn existing fully and not dissolving back to water without her will to hold it together. According to recovered aqueous humour scrolls, Jessudu was very close to doing so but needed to time it with the coral palace's close celestial proximity to the Elemental Plane of Water.
Yawgoth Spawn abilities at full potential were able to disperse and demolish human fleets.