That highly depends on a) packsize, b) healing situation and c) tankcapability.
a)
- two mobs: use corruption and in dungeons(no raids) immolate on both targets and cast a shadowbolt on target A, cast a shaodwbolt on target B, repeat. That way you won't overnuke the tanks (exclude situations when a mob has to be focusfiered) **stay with sacrificed succubus as DS lock
- three mobs: same as before but tab between all three targets **succu sac
- four or more: dot with corruption (up to max 4 targets to give the tank time) and use Hellfire **sacrifice your imp for 15% more firedmg.
- for the tryhards: use oil of immolation and crystal charges as both scales well with the Imp-sacrifice (burning wish)
b)
- obviously you shouldn't hellfire anymore when you see that the group as well as yourself get high incoming damage and go back on range to use shadowbolt.
- NOTICE: do never use rain of fire. That spell is useless in 99% of the cases. Just go back to singletarget as long as its not 6+++ mobs stacked
c)
Not much to say here. Always use your tools in a way that doesn't automatically lead to a painful death.