After a few tries, Lith tried switching with Solus who discovered not only how hard it was for her core to deal with that kind of power but also that she was still attuned to light and earth better.
The other elements resisted their control and there was no time to use Domination.
The exercise went on for hours until even the elder Awakened were tired. Casting the spells without conjuring their effects didn't burden their cores but it still required a lot of focus.
"That's enough for now, kid." Hala said. "We have no idea when the enemy will attack and we can't have you get exhausted before the battle even starts. Go take a stroll, drink some tea, do whatever helps you to recover your mental strength."
Lith waved them goodbye and left the room, knowing exactly what to do. He took one of the small Warp Gates that were the core of Belius' public transportation system and went to his home.