Built like a Snow Golem, using Prismarine Bricks at the bottom, Dark Prismarine in the middle, and Prismarine on top. hold shift while building to not spawn one.

you can give it 3 different items (Pickaxe, Shovel, Shears), and then an item.

if said item is in a 50 x 50 block radius underwater it will dive under and mine said block.

it only has 2 inventory slots with one being filled by the tool. if stackable, it will get a stack before returning. if not found, it will return to the player.

it will drop the items it finds after returning, along with it's tool.

can be repaired, like the iron golem.

possibly upgraded as well if I make models for it?

can't mod or animate in blockbench for the life of me so don't expect this as a mod from me