Barrakh, or rather, Malakh.
The Gehenna Tribe viewed it as an impure energy. Their tribe had always been unconventional in their use of the energy because they didn't believe that it was beneficial to absorb it in its natural state.
The spirits allowed them to purify the energy, and with their weapon techniques, they were able to turn the energy into the pure "barrakh" that they'd been using for the majority of their existence.
There was nothing wrong with this method. The Gehenna Tribe had access to a unique set of powers that nobody else could use, and their familiarity with it allowed them to wield it with enough power to protect themselves.
However…
What was this?
What was Thalia witnessing right now?
Damien used barrakh in its normal impure form. Unlike the white halo that appeared around the Gehenna people when they wielded the energy, his was purple and black, with a heavy aura that was more than just suffocating.