It's been a long time, but a new build is finally up, introducing Soul Brands to the game. Soul Brands are more or less Demon's answer to equipment: randomly generated items that can be applied to characters to provide various bonuses (and sometimes, penalties or restrictions.)
There's a whole lot more to this feature than I can really fit in a comment though. Go read the change list above, or download the game and explore it yourself to get the complete picture.
Cheers, and good luck in the Tower!