In Mushoku Tensei: Jobless Reincarnation , Zenith Greyrat (Rudeus’s mother) was not killed in the Mana Calamity , but she was ripped away from her family and trapped for years in a teleportation labyrinth , which is what “happened” to her.

What actually happened to Zenith

  • During the Mana Calamity , Zenith was teleported all the way to the Begaritt Continent , specifically into the Teleport Labyrinth near Rapan City , where she ended up encased in a powerful mana crystal.
  • The crystal preserved her life but kept her in a kind of suspended‑animation state , unable to move or speak, so everyone assumed she was dead or missing.

How Rudeus found and rescued her

  • Thanks to Roxy’s political maneuvering and the help of the Demon Empress Kishirika , who used her Clairvoyant Eye, Zenith’s exact location inside the labyrinth was revealed.
  • Rudeus then led a party into the labyrinth, broke the crystal , and brought her back to Sharia , reuniting her with the Greyrat family.

Zenith’s condition after the rescue

  • After being freed, Zenith’s mind is severely regressed : she acts like a small child, has no clear memories of her past life, and sometimes cannot speak properly.
  • However, she is alive and physically healthier than her real age , apparently due to the years spent in the mana crystal.
  • The family continues to care for her, hoping she may recover some of her memories and personality over time , but for now she remains in a fragile, child‑like state.