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After I caught up to Megusan, I let Rimuru, Gaby, and Nanako get used to their new strength by ganging on it… long story short, she was utterly defeated without many problems.
She was certainly insane, and after seeing the possibilities of winning, she became even more insane and driven to despair, she tried to kill herself alongside Rimuru, but she didn't expect that my Rimuru was strong enough to even stop her reckless charge.
Gaby and Nanako then assisted Rimuru as the three slain the Demon God's last Soul Piece, everyone was showered in large quantities of Experience Points afterward.
[Kireina] and [Party] gained 232.443.720.050 EXP!]
[Kireina] gained one level!]
[LEVEL 073/250 EXP 0.26.144.271.922/400.000.000.000]
[Kireina] gained +100 Soul Stats!]