Mana manipulation, the most important form of practice required for casting effective and powerful spells was something Kahn currently needed to master.
In the past week after he started his magic training, what he did was understand the composition of various elements such as water, wind, fire, stone and lightning.
The main reason was that he had most of the offensive skills & spells which involved these 4 elements.
Even the Dark Lightning Strike consisted of the lightning element which was half of the force behind the attack. And since Kahn had no sources available to read and study about dark magic in his current situation, he had to at least improve his mastery over this element.
In his hands, were two things that he had been studying since yesterday. One was soil and the other was a burning lamp.