"this is however only done when a changeling has repeatedly in their assigned class." - missing a verb?
"all both Shifter and Mystic sub-classes" - this is clunky and does not express the intended idea, perhaps drop both. Shifter and Mystic are both defined as sub-classes, so what are the bits under them called?
"this is however only done when a changeling has repeatedly in their assigned class." - missing a verb?
"all both Shifter and Mystic sub-classes" - this is clunky and does not express the intended idea, perhaps drop both. Shifter and Mystic are both defined as sub-classes, so what are the bits under them called?