[Kobal2]

Yeah, Solar Brilliance is a "blind 'em all" spell first and foremost, the undead killing is a bit of an added bonus. The killing effect is notable when the battle last a real long time, but mostly it doesn't destroy enough undead fast enough to be worth casting for that purpose alone. Especially not against Ermor or C'tis or similar undead-focused nations who will have spells to buff the MR of their undead minions into the high teens anyway.