The ability to summon sea monster bosses with treasure layout on ship

I think it would be fun to be able to collect skulls, chest and animals and layout them out on the edges of the ship to summon a boss/monster that drops a legendary treasure like Athena's quests.

I think it would be something like skulls on the front and back of the boat, chests on the planks and animals anywhere on the deck. When they are in the correct position, they start to glow brightly. The ship needs to be in open sea and when done correctly, the water starts to glow and the monster boss is summoned.