Clerics have a pray each morning and their deity grants them some spells for the day, meaning if the deity is unhappy it can deny them today’s spells. Warlocks have been given the knowledge of how to cast some forbidden magicks, they don’t need their patron to give them permission to cast what they already know. If a warlock pisses off their patron then they’ll have to come down and rip that knowledge out of their head with their slimy tentacles, which sounds like a great plot, I’ve got some writing to do…