This is ORIGINS IV -  "Balance from Beneath". The World Weavers will be filling in the gaps from ORIGINS III and crafting the world's oceans and sea life. 

Origins is an anthology of character backstories. One of these characters is one of our main characters, and this is their story.

http://voten.mythcraftrpg.com/5

World Weavers - D&D Actual Play is a LIVE 5e actual play that features collaborative world-building, faction play, actual D&D play, and more! Premiering on YouTube every other Monday at 4pm PT // 7pm ET