Originally Posted by Ptoleman
Presumably Dispersion locks you out of about 50% of your DPS if you look at the *very* general breakdown of Shadow Priest DPS. It's roughly 30% MF and 20% MB, with the rest being DoTs.
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I disagree - you aren't actually locked out of mind blast if you use dispersion while mind blast is on cooldown.
If you're using dispersion for the mana, the ideal time to use it on a fight like brutallus with generally no movement is directly after a mind blast and while your dots have at least ~7.5 seconds on their timers, ~9 for VT. Since the talent becomes available for maximum mana return at below 64% mana, there will be plenty of good opportunities to use it and only delay a mind blast 0.5s and lose 5 ticks of mind flay, not accounting for haste.
Using
this WWS parse of Rage, mind flay was 1,090 out of 3206 total dps over the duration of the fight, so if I had the perfect dispersion (using it directly after a mind blast below 60% mana at the same time you have to move out of a death and decay and all dots have plenty of time left), I'm still doing 2116 dps (~66%, not accounting for the 0.5 delay on blast) while gaining 4300 mana.
So, as far as continuing damage is concerned- dispersion is far superior to evocation, although, on a 12k mana pool evocation will return 7200 mana (900 per second) in 8 seconds whereas dispersion returns only 4300 on the same pool (716 per second) in 6.
However, we can't choose between dispersion and evocation, and I really like the damage reduction with the ability to move / use trinkets & items, so I personally hope we keep dispersion
