Any that I've found. [Natasha answers her with one shoulder lifting in a faint shrug.] Sometimes the enemies it makes aren't quite as intelligent as real ones, but you can make them as challenging as you need them to be.

As for price... well, it's the same as everything here. They drop us in a cage and give us everything they think we'll want or need. And in exchange, we occasionally get called on to fight. Or they experiment on certain people, or the village as a whole. It's always different. Sometimes its easy, sometimes it's hard. Sometimes we know it's happening and other times we only find out after its over.