Originally Posted by
Elkfingers
I would suggest going to warcraftpriests and having a read through their guides, they have also simmed all of the traits and you'll find information there about which are better in different situations. If you're new to priest, I strongly recommend doing your research properly to begin with so you don't have to correct bad habits down the line.
The only thing they don't mention, and this is huge on single target, is pre-casting your void eruption. You start the fight in voidform, with a 10% damage buff and access to void bolt and your stacking haste buff - that's huge, especially during bloodlust/prepot. It's tricky on raid encounters because as soon as the boss is pulled your insanity resets to 25 (also why this is risky because if you don't finish your cast before the pull, you just wasted your precast completely), so you want to start the fight at 60+ insanity, and communicate with your tank to find out exactly when they pull. That way you can look at your cast time for VoiEr and cast it so it goes off about 0.1s before pull; your insanity is still going to reset to 25 in voidform, so from there you VB>MB>SW:P>VB>MB>VT>VB>Continue as normal. A slightly riskier version is to go VoiEr>VB>MB>SW:P>VB>VT>MB>Continue as normal, but your insanity will drop dangerously low during the VT cast and you might not have the haste to pull it off without dropping VF. Doing this adds an absolutely stupid amount of damage to your opener.