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Kireina had devoured the Undead Formation that the Necrotic Death Lords had created to absorb and assimilate demonic energy into their own necrotic energy! This caused them to grow completely angered over the fact they won't be able to continue their work which had not only taken them this trip here, but many years even before.
They had, after all, been investigating this entire thing for a long time and now that their work was finally coming to fruition after so freaking long, only a few minutes before actually acquiring the power of the demons… all shattered before their very faces! Kireina's smile and smug nature, as if she wasn't worried about anything only made it worse!
They felt like cursing her…! Frustration, sorrow, anger, and utter horror all combined together inside of the Necrotic Death Lords' minds as they looked at Kireina and her allies with the most utter anger they could ever muster!
"You damn monster! What have you done?!"
Check "The Protagonist's Sister Is Actually the Strongest"!