It was just telekinesis.
The negative energy gathering technique was going to become very useful. As long as he had enough negative energy, he would have access to three abilities.
Telekinesis, possession and illusion, casting.
Of course he had to have enough negative energy first before anything else. The effect of these abilities might be very weak at first glance, because even at the strongest level that he could achieve in theory, it would be hard to cast an illusion against a creature of a similar rank.
But still, these tricks could prove fatal during combat, even if it was a distraction for a fraction of a second it could prove fatal in the life or death situation.
More importantly, if he found a way to negate the side effects of the negative energy that the pharaoh told him about then…
But of course, it was not something that would happen overnight, especially since disability did not appear in the system, and could only be improved by rigorous training.