Shattering

Shattering is a debuff in the Kell's Fall Exotic mission. It is applied when the Refracting timer runs out while a Guardian is in the Revenant Plane mirror realm. Refracting lasts 2 minutes and 10 seconds, and leaving the Revenant Plane before it expires refreshes it on re-entry.

Once Shattering is applied, it damages the Guardian and eventually kills them if they remain in the mirror, so the safe approach is to leave before the timer ends. The debuff is most often met during the Hiraks, the Mindbender encounter.