A weakaura that pops up a reminder when its due to tricks your warlock to snapshot their drainsoul.
It loads on the following bosses:
Razorscale (boss only, not on trash)
XT (boss only, not heart)
Iron Council (Steelbreaker only)
Algalon
Auriaya
Thorim
Freya (Freya only)
Mimiron (only middle and buttom, not aerial command unit)
Yogg-Saron (only last phase)