[Her tone is more solemn, as this is never a pleasant topic of conversation.]

Tranquil are mages who have undergone the Rite of Tranquility, either voluntarily or not. This rite severs their connection to the Fade; Tranquil can no longer dream nor draw on the Fade to perform magic. As a side effect, their emotions are removed as well, making them undesirable to demonic possession.

To my knowledge, there is at least one. His name is Casimir Lyov.