Critical SuccessYou conjure the demon or demons. They're eager to pursue the task, so they don't ask for a favor.
SuccessYou conjure the demon or demons. They aren't eager to pursue the task, so they require a favor in return.
FailureYou don't conjure any demons.
Critical FailureThe demon or demons are angry that you disturbed them. They appear before you, but they immediately attack you.