I purchased The Temple of the Sea God as a battle map for the pirate god's temple from Freeport. There's not a lot of work with to create a water temple – pools are a given, so that leaves other "sea god"-like paraphernalia: tridents. There are only five tiles in this set and every one of them has a trident in it. The altar features two tridents and two mermaids. As a generic water temple, this is an excellent supplementary set. But if your sea god doesn't use tridents then you're out of luck.