From PathfinderWiki
A ritualist.
(Prestige class)
Classes Spellcasters
Progression 10 levels
Images of ritualists

Source: Chronicle of Legends, pg(s). 12

Ritualists are spellcasters who focus their skills on occult rituals, making these spells less likely to fail or cause unintended harm. Because of the vast knowledge, time, and training needed to become one, all ritualists have to be members of esoteric orders, though their studies often lead them down paths avoided by their peers in the occult. Ritualists regularly risk death (or worse) by interacting with dangerous magic, but the most powerful ones can learn and perform rituals at an unmatched speed. Some ritualists are particularly fatalistic, obsessive, or unpredictable in search of occult power, often endangering their peers and leading to their ostracism from occult societies.[1]