Chronal Displacement

A willing creature you touch becomes disconnected from time and doesn’t age for 1 year.

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 the 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.