Prismarine Crystals are obtained by killing guardians and elder guardians in ocean monuments or by looting buried treasure chests. They are a renewable resource, often farmed through guardian farms.
Prismarine Crystals are primarily used to craft sea lanterns, a bright underwater light source. In Bedrock Edition, they can also be crafted into prismarine shards, which are used to make prismarine blocks and prismarine bricks.
