>>573660Go to the item shop and buy an antidote or use a white magic spell
It can fall off by itself, but sometimes it just stays for a really long time or possibly forever, idk why maybe it's based on enemy level or something.
The game is kind of charming in a way, it doesn't tell you anything, you don't know what the spells or items do until trying, there's no item descriptions, the only reason you know a weapon is better is because it costs more at the shop.