The Lagoon Golem

The "Lagoon" golem would be similar to the iron golem and snow golem, but it would protect the waters instead. How to create: This mob can be crafted with a turtle egg and a conduit in the crafting table and creates a new egg and can be hatched like a turtle can, but only underwater. This could also add the lore, the conduit is crafted with a HEART. Special Abilities: Can block any projectiles, including arrows, tridents, ender dragon fireballs, ghast fire charges, and blaze fire attacks, tridents, and wither projectiles. and any other mob that can use projectiles, it also projects it back towards the other person. The way it does this is with a shield like outline like what happens to the wither when it gets half health, except it looks like the effect that is put around the player when using the riptide enchantment. Similarly to the conduit, it fights nearby water mobs, but it can also fight zombies, husks, skeletons, strays, spiders, cave spiders, and witches. It can fight mobs that attack it. When near, gives you an unseeable luck of the sea 1 effect, conduit power, and possibly could summon dolphins to help you swim faster, like an evoker. One disadvantage, drowneds can break the eggs and have higher range to detect them. This mob  can also be damaged while in combat, but and when dead drops a conduit and a scute, so to revive this mob you just need to go get your silk touch pickaxe and mine some eggs, then wait for it to hatch