The sight of the Flame Imperator's healing drew terror in the hearts of the Prima Universe's warriors. All their sacrifices would mean nothing if this one managed to recover.
As for the Primordial Legion, seeing the Flame Imperator rise again would have thrilled them any other time, but this one was using their bodies and soul to achieve that recovery. Not only were they terrified, but a feeling of utter betrayal assaulted their minds and shattered their spirits.
Chrollo and the rest of the Empyrean Primordials could endure the shadow flames better than the rest of their brothers' thanks to their cultivation. When they analyzed it, a shocking revelation assaulted them.
The shadow flame had been with them for a very long time. More precisely, from the moment they opened their souls to the Flame Imperator and made him the Alpha Universe's Spiritual Leader.