Originally Posted by Sapphidia
You have an enchant that works like the Shattered Sun Scryer Necklace proc. That is, a high proc chance, and internal cooldown (50% and 20 seconds is the implication so far). The fact that a proc from this deathfrost enchant is an identical bolt to the melee one is kind of inconsequential, it seems its treated totally separately.
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The internal cooldown is somewhere between 21 and 28 seconds. It's not 20.
Here's an admittedly short test that I ran
Wow Web Stats
It doesn't proc off the application of dots or dot ticks as per the description.
It likely doesn't proc off Timbal's (10 procs, no Deathfrost).
When cycling Mind Blast (7 second total time between casts), I never saw a proc on the 3rd Mind Blast, it always took at least 4 casts.
Including the initial proc in the log it breaks out as follows. I'm assuming that the first 3 casts in successive applications are always within the cooldown.
casts, count
1, 6
2, 3
4, 2
11 procs in 20 casts, no where near enough data to pin it at 50%, but for my purposes I'm happy assuming it to be 50% and 24-25 ish seconds (stdev on 20 tries of a 50% chance is 11.2%). If it was a 20 second cooldown my 3rd spell would have applied the debuff at least once as 10 chances, 0 successes at assumed 50% is a 1 in 1024 chance that I wouldn't have seen one.