Also accepting Elven Crunchy Roll.
You all make the decisions, I'm just along for the backseat driving. You could allow the water/curses to be multi-combat spells with the book. A teleblock would be normal on the player that the spell is cast on 5/2.5min. The surrounding players could recieve 2.5/1.25 TBs. Same reduction effect for all curses. Idk, I think splash damage and Tome of Water sound hand-in-hand.