Teacher
From UnderlightWiki
A teacher is a player or GM who has the ability to grant arts and are denoted by a halo. A dreamer is required to satisfactorily complete a series of tasks, assignments, or whatever their teacher mentor requires and, finally, a series of interviews before being granted the rank of teacher. Only with additional training can a teacher grant a sphere. If a known teacher does not show their halo it means that they are not actively teaching and approaching them for a task would be inappropriate.
List of Current Teachers
GateKeeper
DreamSeer
SoulMaster
FateSender