A rougelike where you play as a weak monster with only one ability: the ability to possess other monsters. Possessing monsters will give you access to their abilities, which you can then master and take back into your base form. It's a pretty cool concept and I enjoyed playing around with the different monster types. It definitely runs into the standard problem of magical builds just not being worth the effort, though, and there are a lot of monsters with ridiculously high defenses that just take ages to kill.