Osiris had planted the Seed of Despair in all six Royal Heirs of the Minor Kingdoms when they were but 1st-phase seekers, and since he had also personally mended their wounded minds and souls with his demonic energy. The potential of the six had been significantly boosted.
Thus, once they had advanced to the 2nd phase, the Race of all six had evolved into Partial Demons. Though only one amongst them had awakened their Demonic Ability as of yet, that was, of course, Conner Ravenspire, the man with the highest potential of all the Seekers from the Minor Kingdoms.
Six royal heirs all surrounded Lucien from all sides, their collective pressure mixed with the potent, destructive might of the demonic energy brushing against Lucien's skin. His own golden pressure flickered, holding against the demonic energy's influence quite well.
