I think I may have missed some unusable audios when I went through over 1200 audio files that was labeled with his name.
https://huggingface.co/PGR-RVC/NieR_RVC_v2/resolve/main/EN/GrimoireWeissEN_RVC_v2_RMVPE_270e_Ov2.zip?download=true

A hovering, magical tome that serves as Nier's medium to magical spells known as Sealed Verses. Originally a human male, he was absorbed into a grimoire after being subjected to experiments by the Hamelin Organization.

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huggingface.co/PGR-RVC

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Download Link: https://huggingface.co/PGR-RVC/NieR_RVC_v2/resolve/main/EN/GrimoireWeissEN_RVC_v2_RMVPE_270e_Ov2.zip?download=true