No. The mod was very tightlipped about giving me information on any roles other than my very own. Essentially, under certain circumstances, I can heal any persistent harmful effect on a player that would otherwise continue to apply. It's like a poison cure but with the added benefit that it can act as a preventative so if someone is supposed to be poisoned that night, I can block it, and if they announce that they were poisoned, I can cure it. But the word "poison" is not used anywhere. Mod went with "harmful effect." So I would imagine that includes a status like "rusting" given the flavor in this game.