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The Necrotic Death Lord felt ridiculed! How come it was possible for pathetic low-level trash-tier beings such as Slimes to be this strong?! There were two at Supreme God-level fighting against him right about now, and their power was incredibly commendable!
The amazing power that Rimuru and Popi exuded wasn't without effort in acquiring it, Rimuru had been slowly growing stronger since Kireina's journey began, at her side, she had been growing and leveling up, evolving at the side of her Masta, and becoming more and more beautiful in the way as well!
Check "The Protagonist's Sister Is Actually the Strongest"!