Warlock has a lot of nice builds. Chaos-Fire, Abyss/miasma chains, eldrich tree (I know little about), fire-demon focusing on Tainted, Bind Demon focus using defilers, Blood Boil build. Lots of options. Check out Maxroll builds to get some ideas.
I've never played HC, but if I did, I would go Demon tree. Max Bind Demon + max Demonic Mastery + max Blood Oath gives you a very tanky demon. My dark lancer, perhaps the "squishiest" of the preferred demons, just face tanked Diablo Clone without losing a sliver of health. I just Death Mark 'd her to the other side of DC so he was facing away from me and never grabbed any attention whatsoever.
If you want supreme survivalbility, I would bind a unque pack leader Urdar from River of Flame, preferably with Stone Skin, Cursed and Lighning enchanted affixed (but really, any Cursed one works). They have a large hit box and get "Teleport trapped" when you Teleport and can't move till you do or you Death Mark them--this can be annoying but also taken advantage of in HC b/c missiles hit him instead of you, except piercing, I think. So, for example, when I hit a Cursed Urn that might turn into a pack of archers that kill me, I hit it and immediately Teleport, leaving the Urdar taking all the hits.
Re: other stats, you can pick what you like, whether that is maxing Blood Boil, maxing Tainted, maxing Goats/Death Mark, or just using defilers and delving a bit into one of the other trees.
Because I like having max resists and easy 125 FCR without having to spend more on a +2 / 20 fcr necklace which costs more and drops resists even further.
Obsession with its 65 FCR and 60-70 all res makes gearing the other slots much cheaper.
Also you are already sitting at around -55-75 fire resistance without mang song from skill (-40), Flickering Flame (-10-15) and Renewed sunder (-5-10) and an uber jewel (-5-10) and 1 shotting everything in p8 already anyway
The extra -10 to 15 from mang song in exchange for not having 125fcr or not having capped resist is not worth it to me.
For people that just like seeing bigger numbers on character sheet but less qol mang songs is their choice
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Whero
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