Prismarine Blade

The Prismarine Blade is an Sword that is unlocked at. It is not recommended as a weapon due to its poor damage and strength. But, the only good side to this weapon if you are running Floor 3's and can go in the water, which will deal 200% more damage. But, besides that, players shouldn't use this weapon due to it's poor stats.

Crafting
Crafting Recipe for the Prismarine Blade:

Prismarine Shards
海磷刃