While I do understand him learning a number of blue magic spells during his travels, I simply can't accept him learning the Primal-related ones (without serious injuries or even tempering).

Especially Quasar, I mean...what?
Sophia was imprisoned in Azys Lla for millennia (only being released for her final defeat), how did he learn Quasar from her, exactly?

It simply doesn't make any sense...