Corruption Day

(you can edit to also fit your dimension, just leave to other parts that were not made by you alone)

Dimension 1367
On this day, one person only gets corrupted. There is nothing you can do but wait for it to fully take place and try to restore the corrupted memories. But if that task is unsuccessful in the first 24 hours of the person being fully corrupted, there is nothing you can do to bring them back.

The day this happens is on september 2 every 2 years, usually around the time of 9:30 at night. The moon turns red to indicate that a person is starting to corrupt.