Prismarine Golem - A real boss for Ocean Monuments

Right now, Ocean Monuments only have Elder Guardians, which feel more like mini-bosses. Also, once you craft a Conduit, extra Hearts of the Sea just sit in chests with no other use. What if we could place a Heart of the Sea into the center of an Ocean Monument to wake up a giant Prismarine Golem? It would be a heavy underwater boss made of prismarine and sea lanterns. Instead of a normal sword fight, its outer shell would be too thick for arrows and swords. You would have to crack its prismarine armor using a Pickaxe or a Trident first to expose its glowing core, while dodging its underwater shockwaves. Defeating it could drop Sponges, Tide Armor Trims, or a guaranteed Trident. This would give Ocean Monuments an exciting final boss fight and finally give us a reason to collect more Hearts of the Sea.