I think this points out an information gap. The intended user of an item should be clear when viewing the item - in the game, not after discussing it on the forum. Presently, I am told that the item is not in my Hero's class, but I thought that my warrior merc could use it - I had to guess. Thankfully, this is acknowledged by Oton earlier and the popups will be modified to identify not 'who cannot use this item' but 'who can use this item'.