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Kireina's new creation was a combination between many concepts together as one! Utilizing the Path Jewel, Egos, Maxima Summons, and Spirits of this Plane together, to create a singular, unique being that qualified as many of these things at once.
Utilizing the Bone that the Primordial Null had gifted to her some time ago as its primary material aside from the Path Jewel of Necromancy, Kireina was able to revive Aldrich, an Ancient Menace of the Necrotic Plane, who for mysterious reasons ended appearing within her Path Jewel as a summonable entity.
But how was she able to revive him so easily in this new form? What were the concepts and inner linings that made it even possible? Well, it was all revealed to Kireina as her Dao of Egos and her Dao of Necromancy constantly improved into higher and stronger comprehension and forms.
Check "The Protagonist's Sister Is Actually the Strongest"!