Ok so I picked 5/5 Spirit Tap talent. It’s absolutely incredible for questing as I virtually never run out of mana. I THOUGHT it would be great for healing dungeons, until I figured out you have to actually make the killing blow on an enemy for it to proc. AKA, it doesn’t just happen when a mob dies. So as you can imagine, this is quite difficult to do when you’re healing a dungeon.
So my question is, is it worth the mana spent to try and throw in something like a mind blast last second and hope you make the killing blow so it procs?
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It’s absolutely not worth throwing a mind blast IMO. It’s nice if you get the last hit during a dungeon, but I hardly ever found myself pulling it off on my way to 60. I would usually just wand the target and hope I get it. Either way drinking for mana is significantly faster than waiting for even spirit tap regen, and most tanks aren’t going to let you stand around to regen before the next pull.
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Just wand, you might get lucky. No point wasting mana for the small chance of getting a proc.
With some practice, you can get the mind blast killing blow more than half the time. I don’t think it’s worth speccing into it with a healing build, but it’s nice if you are healing a dungeon in your shadow leveling spec
You will have to get lucky, but wasting mana in the hopes of proccing Spirit Tap is probably counter productive.
If the group is topped up and the fight is about to end, use your wand and try to get the last hit on a dying mob. You probably won’t get it every time, but I found this to be the most reliable way to fish for ST procs while healing in dungeons.
It takes practice & timing. I had gotten pretty good at proc’ing it in Dungeon groups back in the Vanilla days, since I was almost always healing as Shadow spec back in those days just to add some extra excitement & resource management fun. It almost became a mini-game for me to get it to proc. 
Always worth trying. But you don’t really need Mind Blast. Just make sure they’ve been dotted up with Shadow Word Pain already and then just wand them.
But overall, when in dungeons, work with the assumption you WON’T get the killing blow and manage your mana in consequence.
sometimes I’ll use mind blast or smite to last hit. I animation cancel pretty aggressively to make it work, but I played a lot of dota so that’s something I’m comfortable doing. It’s pretty rare that I finish the cast and don’t get the last hit. It’s much more common that if I don’t get the last hit it’s because the mob died before I finished my cast. But I mostly do this if I’m bored, not for efficiency.
No. Use your wand to get the killing blow.
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Generally not.
Occasionally, I do it when I’m pretty sure I’m about to get the killing blow, or if it’s useful for other reasons (e.g. a runner takes off from a melee group).
Otherwise, just wand and cross your fingers. It’s nice when you are lucky.
I do it all the time. It makes healing dungeons more interesting and you can postpone going oom and holding up the group having to drink all the time. However, if there’s another priest in the group or a warrior dps it becomes less reliable. 2 warriors chew up that last quarter of health on trash mobs insanely quick.
Also, clearly, its not worth speccing into it for this, but if you’re leveling with shadow its worth trying. See how it goes on the first few packs and go with it if you can consistently proc it.
Just wand on the last mob. I usually get about 1/4 killing blows wanding. Which lets me drink the cheaper water after that pull. You tend to get it when you have caster heavy group vs more melee.
My two cents, if you are already going to be dedicated to healing, drop Spirit Tap entirely and put the points elsewhere. By the time I was 50+ I wasn’t doing any questing anymore. Just regular dungeon runs.
I get way more than 50% of my Mind Blast Spirit Taps on my priest in dungeon groups considering how much damage it does, as healer… it’s not that tough.
But, I have continuously been at odds trying to figure out if Spirit Tap’s been worth it or not in the first place, so your mileage will likely vary no matter what. I always struggle measuring if the burst of mana spent is worth it when we’re thrust straight back into combat and mana regen is cut.