I know that a rust monster can devour your weapons and armor, leaving you defenseless in a dark dungeon, but in what case will they actually harm a man, and how? I’m sure when cornered or attacked they’d surely bite back. But from what I’ve read, they’re pretty harmless.
If a PC is wearing armor, and the rust monster tackles the PC to consume said armor, might its mandibles damage the PC as it does so, until it’s done eating?
And what do they eat when there’s no natural metals and no adventurers roaming in the dungeons? It seems like they stay hungry for a while, and maybe that’s why they’re so likely to rush any source of sustenance.