Lenneth

This was because the flame wasn't burning automatically because they were his innate skills. They were burning because he had achieved control over his Mental energy. Now he could incorporate this Mental energy into his Mana type skills and even pure mental skills.

True human gains ability to control soul/ mental energy.

Mental concentration recovery: +100%

Spiritual endurance: +100%...

Mental energy was an abstruse kind of energy fundamentally different from Mana but had similar controlling methods. But even with that, controlling one's Mental energy was difficult and Xuanyuan only had an easier time due to his Mana control and his innate abilities and mastering it came with astounding benefits.