So, this is a pretty big game. And sometimes small but important details get forgotten in big projects.
I noticed that when purchasing weapons and armors or going through the menus, the game does not tell you if you or another party member can equip it. You either can and it shows up, or it doesn't. But I just bought a Cold Forged Hammer, and I can't equip it, and the game doesn't tell me which classes I can be to use it. It is a basic standard in video game design to notify the players of these kinds of details.