Assuming you have extremely good RNG
Assuming you have extremely good RNG
There's no internal cooldown. If you get multiple procs in succession, the buff refreshes its timer.
Not 100% sure whether or not there is an internal cooldown. On Heroic Staghelm tonight it procced 9 times for me with a 12.3% uptime, equating to 68.2 seconds active over a 9minute 14second fight.
Had an 11.4% uptime on Heroic Baleroc tonight too.
9 Times!? It barely procs twice a fight for me...
Well, I spent 10 minutes on the training dummies eariler and it procced 3 times. In (non heroic) fights in Firelands it never procced more than twice.
If you read the tooltip it says it procs from Soul Fire, Incinerate, Shadow Bolt and Drain Soul. If you use Shadow Bolt it does have a chance to proc it, regardless of the spell's cast time.
Can confirm that Apocalypse (T12 4p) DOES proc from Nightfall or Glyph of Corruption Procs. Tested by spamming corruption on target dummies in Stormwind and throwing instant Shadow bolts.
On a somewhat related note, Apocalypse also follows the same rules as Demon Soul and other % based procs, meaning that the % Damage increase DOES NOT update your dots. You must refresh them in order to take advantage of the proc.
Last edited by Derishi; 2011-08-06 at 02:52 AM.