The Four Forms of Watershaping

 is a quest item in.

Behind the scenes

 * This item isn't currently used in any quests (as of 05.03.2019). As stated by one of the narrative designers, in a forum post:
 * "If my memory serves, there used to be a puzzle in the Watershapers Guild which used that item as a clue, but the puzzle was ultimately cut. I guess the flag identifying that book as a quest item wasn't un-flagged."