What spec are you playing 5.2?
I want to give frost a go since it has been so long since it was truly viable for raiding, but Mumrit's comment rings true.
Also, fairly new to the Mage forums, is there a web site dedicated to mage discussion (similar to How2priest.com for Shadow Priest/ Priest in General)?
The fact that Freeze will not affect bosses means you lose the FoF from it, but will gain the damage from Frostbolt and the increased proc chance of FoF to compensate.
On multiple target fights Frost will probably take a hit, DPS-wise as losing 2 FoF per Freeze will probably not be compensated enough with the changes presented. The Invocation rework is also probably going to hurt Frost a little. Also no more Scorch to fish for FoF procs.
So really there's no buff to speak of to justfiy that Frost will be viable for competitive raid. Keep in mind that Frost scales poorly when up against Fire & Arcane, and normal gear has gone up to 522 next patch. So basically the better geared you are as Frost, the more better off you are changing spec to Fire/Arcane.
Frostbolt damage and SP scaling increased by 23%.
So ya, sure, Frost scales poorly with gear (but that's mainly an issue with crit), still this buff is a pretty big deal.
I'll be playing the top spec. I'm pretty sure it's going to be Fire, at least after getting some gear. I would love to play Frost, but after 6 years of "don't worry, we'll make Frost viable in PvE eventually" I have surely given up. I know it's viable, but it's just still a little too behind the other two specs at the moment to really be ok playing it. Still hoping though!
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