Taken from
here.
SPELL EXPLANATION (Netherealm):
This is an aura spell. It is classified beneficial because you cast it on yourself. It’s base duration is 30seconds. Instantly and every 5 seconds (base) it casts a detrimental on all targets within 25m of you. I REPEAT!!! THIS SPELL IS ONLY EFFECTIVE UP TO 25m. In other words… the same range as your absolution, encase, dark nebula and aura of void. The moment you are done casting the spell the first 25m aoe detrimental goes out. This effect lasts for 5 seconds. If during that 5 seconds that mob is damaged with any noxious spell (any noxious spell… not just your own) it will trigger the damage on that mob. All the damage counts as yours, not as the person casting the spell. Every 5 seconds it re-applies this detrimental to all mobs within 25m of where you are (not from where you casted it). This adds up to a total of 7 ticks (Initial + 30s/5s). If a mob is not damaged for one of the 5sec periods that damage is lost, the next detrimental applies over the old one. If you precast when the mob is inc but outside 25m you lose your initial tick and any ticks after that if the mob is still outside 25m when they try to apply.
The achievement for netherealm reduces the duration by 10 seconds making the duration 20s instead of 30s. This means that over 20s you have 6ticks. 20s/6 = time between each application which is 3.33s. The detrimental will still remain on any mob for 5 seconds but if that mob is within 25m when the next detrimental tries to apply 3.33s later it will override.
neitherrealm
