Chronal Displacement

A willing creature you touch becomes disconnected from time and doesn’t age for the duration of the spell.

The spell’s magic is erratic. Each day, there is a 5% chance that time slows for the creature for 24 hours, causing the creature to act as if under the influence of a slow spell for the entire day. In addition, the creature has disadvantage on any saving throw against any magic involving time or aging during that 24-hour period.