Originally Posted by
Poltr
I'm pretty sure it's a RPPM trinket as I've had pulls where it proc'd back to back and other pulls where it didn't proc at all. When it procs it starts off as a debuff on the target with a 20 second duration and 0 stacks.
Every 2 seconds or so it will either gain 1 stack or spread to 1 target.
When it spreads it keeps it's current duration. So if it spreads with 10 seconds remaining the target that it spread to will also only have it for 10 seconds remaining.
The added damage you gain from the proc only procs off of direct damage spells. So for example spells like Mind flay or Vampiric touch will NOT proc the extra damage but spells like Mind blast or Shadow word: Pain DO proc the extra damage because they have that direct damage right away. Dot ticks do NOT count.
If you cast a MB at a target with a debuff currently adding 20k damage you'll end up with 150k MB damage + 20k Proc damage.
Hope that helps