--- I’m mellltinng, shrieks the lich, sinking slowly into the deadly pool. Now we’re getting to the good stuff. Unlike poison, which generally has to be ingested or injected to cause harm, acid damage comes from corrosive, dissolving substances that are harmful to the touch. It’s a good DnD damage type because it’s highly consistent. Though there are no monsters with acid vulnerability, very few monsters are immune to acid’s (I was going to say charms, but that’s not it) power. Acid does struggle against some inanimate creatures like the [5e mimic](https://www.wargamer.com/dnd/mimic-5e), but overall spells like Melf’s Acid Arrow are reliable favorites. Along with fire, acid is also a damn near requisite for fighting trolls.