The vial is hot in your hand, promising fiery destruction.
Full material breakdown in the crafting calculator →
1 Corked Vial + 10 Sulfur + 10 Proustite Powder → 1 Blob Bomb: Lava
Unlocks once you have stood near a Workbench of level 1 and picked up each of: Corked Vial, Sulfur, Proustite Powder.
