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Hi! It might be this one:
https://www.mangago.zone/read-manga/i_m_gonna_annihilate_this_land/
Yess this one! Thanksss
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He was office worker died, reincarnated to a skeleton, became a lich monarch? Just strong
Then meet eith the Gos who promised that if he did well they will reincarnated him again as a human. Turns out they were kust using hi. Then he goes rampage and so on. But he got "trapped" atleast thats what the gods think but he was reincarnated as a human then reason is instead of yi sak, the god pronounced izaak or something