As enemies get more life it's going to make sense for players to put it on 3-4 heavier targets and then try and kill them within 15sec so that the Haunt can spread and reset. Or if Haunt is powerful enough to kill enemis in like 10sec you can just throw a few out and have it spread.
My point is that it doesn't really make sense to cast like 10 Haunts anyways because you aren't taking advantage of the spreading effect that it has. The runes can change this of course but I'm not sure how good of a build you'd have if you relied on having 10 Haunts out at one time.
I'm still not sure Haunt functions really well. The spreading is its core mechanic / what makes it compelling but 15 seconds is an eternity in Diablo, I'm not sure I've ever seen it spread more than once or twice a game, stuff dies too fast.
At least haunt has a use now. I could at least see myself using this spell in certain builds now.
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"Is God willing to prevent evil, but not able? Then he is not omnipotent. Is he able, but not willing? Then he is malevolent. Is he both able and willing? Then whence cometh evil? Is he neither able nor willing? Then why call him God?"
I've noticed it's kind of hard to fit Haunt into builds because it's not going to be useful against single targets. Against bosses that spawn minions it'll be pretty good I think, but if you get it you find yourself needing a single target Primary spell... and then you end up wanting another single target spell that does more damage than the primary ones.
I dunno.. it does seem like it needs some tweaking somehow.and 15sec is a long time.