Improved Aurora (3.5e Feat)
From D&D Wiki
 Improved Aurora [Frost Knight]
Your aurora is harder to resist. Pity those caught in its unforgiving light.
Prerequisite: Aurora class feature
Benefit: All of the save DC's to resist your aurora are increased by +2.
Special: This feat may be taken up to three times (one time per level of aurora you possess). Its effects stack.