Legion20
I'm guessing that after Jakra and Thrud are dealt with, that Lith will kill Xedros and claim Xedros's treasure for himself.
Considering Salaark's comments on his last fight with Qysar, I think that upgrading to violet core should come by increasing his body mass (as if refining his body to prepare for his auxiliary vortexes awakening) while circulating mana through his vortexes by casting spells and the like. Maybe the violet core will come from this fight? The only fault in the method should be depending on Solus to gather world energy, after all only Lith has her. Other question: why didn't they explore this method outside battle? Just for the sake of an action scene in the plot?