Rift Quest:Forced Retirement  

When you use the Sigil of Undoing on a Keeper (50% or below) he will freeze and say "Critical Failure! Core Breached! Destriction Imminent in: 3!... 2!... 1!...". This is your clue to get out of range or suffer damage and a significant knock-back.

We strongly suggest you head straight for the three damaged units you need for Unlawful Tampering, as the Sigil of Undoing will cease to function after you complete 10 deactivations, and using it to get to the obelisks makes Unlawful Tampering so much easier to finish.