Through their binoculars and other observation tools, the vultures in the second and third checkpoints witnessed how with the snap of a finger, everyone in the first checkpoint dropped dead.
Shocked as they were, some of them rushed to summon their gang leader, fully aware that whoever the intruder was, he was at the very least as strong as their boss.
Aza'zel was busy inspecting the effects of his death knell origin spell with great interest, as he had his own thoughts about what energies to use in combination for various effects.
Raw source energy can unleash a destructive effect while introducing spiritual energy to the mix could strike on an ephemeral, unseen level. He had yet to figure out a way to implement effects derived from Exsanguinator into this spell, but even his current understanding was far from touching the basics.