Rituals, which are rare in general gaming, have a "step" up to perform the magic.How I run ritual, is that each roll, ticks off to another . Depending on the ritual it can fail miserably, fail, succeed, and succed well. How we do modern ritual based on modern ideas in are games, is that each ritual.
As compared to a quick spell. They can be major altering abilities. However, if one thing fails the ritual weakens, or fails. Also rituals often need a special place. One thing is that a player can only know if the ritual succeeds or fails . NOT WHICH roll failed.