Slimeum

Slimeum is a crafting material used to make Slime Armor and Slime Weapons. It is obtained by mining Slime Rock in a Slime Cave, but only when the cave incursion objective is to mine slimeum ore.

Because it is tied to Slime Cave progression, Slimeum is not a general-purpose surface resource. Its main role is as a mid-game crafting ingredient, so players should save what they collect for the armor and weapon recipes that require it rather than using it casually.