[Endoperez]

Both boost paths. That's their main use, and the only other power I remember is slight bonus to penetrating enemy's magic resistance. The magic boost is what makes them very, very good.
Elemental paths: fire, water, air, earth
Sorcery paths: astral, nature, death, blood

RoS boosts sorcery paths, RoW boosts all paths (both elemental and sorcery).