fire

One of the most important ingredients to keep in storage. Fire mainly drops from Agni, and it matters because it is the easiest way to craft hinokagutsuchi, the strongest melee weapon in the game.

Agni is not especially hard to access once you know what to look for: it appears in normal world generation, and later on you can also craft an agni capsule for a more controlled source. That makes fire one of the most practical high-impact ingredients to farm on purpose.

Can also be placed directly on a block with right-click to set it on fire.