The general term for magi who choose to study more than one sphere of Arcana. As a rule, a mage who studies two separate and cooperating spheres may become a Journeyman in both. And those few who choose to study three spheres at most may remain only at the Initiate level in each.
Note: some spheres may not be studied together, even as a hedgemage. These spheres are:
Necromancy and Thaumaturgy.
Druidism and Sorcery.
Ikos and Song.
For more information, refer to the Arcana Primer.
Credits to Skay Ravendi.