A Mystrae can cast spells as a Fae Sorcerer of a level equal to the Mystrae's racial HD. If the Mystrae later gains levels in a class that gives a Bloodline, they must select the Fae Bloodline, and these levels stack for determining spells known and spells per day. If the Mystrae later gains levels in another arcane spellcasting class, they get a +2 bonus to caster level for spells from that class.