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My understanding of calling arts is that you're bound here for a set duration, probably several months or permanent, but you could in theory be either banished home by another caster who knows the spell, or if that's unavailable, killing the one who summoned you should break even a permanent duration as the spell is bound to him. Help us instead of him, and fight his command, which should appeal to your anarchic nature, and you won't die here and now. I won't even ask for a debt to be filled later: you do something for me in the short term, you stop getting tortured here and go home alive.