{Usurper of Cosmic Thrones}
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Aside from those Authority-related Skills, there was this one new Magic Skill I got, which was pretty interesting! I am quite bummed that I didn't get something like "Maxima Summon Magic" but I guess the whole concept is more than just summoning in general, but related with the specific summons I have… Nonetheless, the Fragment of the Soul of the Necrotic Plane Ruler gave me a much different reward too:
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[Primordial Necromancy Divine Magic: Lv1]
A Unique Divine Magic that can only be conjured by the strongest Necrotic Death Overlords in the Necrotic Plane. Allows for the control of the concept of Death, Necromancy, and Souls to an incredibly high level by spending Nether Energy, the unique energy that flows in this pseudo dimension.