Favour Summoning: Risk: Low - Highly unlikely to harm summoners Cost: Low - Will follow most orders without requiring payment from clerics of their supported deity Difficulty: High - Require a similar mission to the summoner or to in service to the same deity/deities of the summoner
Enslave Summoning: Risk: Average - Will struggle against the summoner as often as they can and will likely request divine intervention against the summoner from their deity Cost: Average - Required magic binds strong enough to force servitude Difficulty: Average - Any celestials that can be found and bound