So I was just wondering, do you retain the discount and coolness passive once all three charges are used? -No

Pretty sure that I just lost my gold key that opens a jail cell from using this item, jail cell key never dropped and the boss didn't drop it either, so im forced to assume that since I used the iron coin it must have killed the one enemy that dropped the key.

does it work on bosses 14:25, 28 June 2019 (UTC) -No