Requires Sartharion set as focus.
Displays icon when Gift of Twilight is on Sartharion, icon glows red when Power of Shadron debuff is active simultaneously.
TL;DR - Gift of Twilight icon displayed and glowing? Tank needs a CD to survive Flame Breath.
When the icon stops glowing (Shadron dead) there is still some danger, but less so.
Icon disappearing also serves to indicate when DK can Death Strike Sartharion again
Useful for both tanks and healers