I lost a run the other day to a series of events, one of which included me (in-game) finding and eating enough psychedelic fungus to trigger a shift in reality, which transmuted all smoke in the universe and any created thereafter, into acid. Like carbolic acid, not the fun drugsy kind.
Acid, naturally, eats through all creatures and materials in the game world, including many things you'd consider otherwise invulnerable, until it evaporates - into flammable gas.
Therefore any time an object or material caught fire (which is often, with or without player interference), it would quickly consume anything below it for several meters while feeding itself with flammable gas and spreading to any new flammable materials it uncovered.
Also, as someone who didn't understand this, most of the crazy stuff you get right away. I think because it sort of looks like Terraria I thought a lot of stuff is crazy high level items but it's not.
That's just the beauty of its spell system, found yourself a trigger spell, double cast, and chainsaw? Well now you have a gattling wand. Want to impose 4 billion damage onto your archenemy? One simple spell may do the trick