Just started a blood boil warlock on hardcore looking for some advice on the build. So far I have been enjoying it quite a bit, In my limited playtime(with minimal gear) i noticed that it struggles a little bit on bosses.
Is it worth it to invest in death mark to boost the crushing blow on the goatmen? I maxed blood boil and synergies, demonic mastery up to level 20, 1 into hex siphon and 1 into blade warp. Just wondering where to put my spare points.
Thanks!

Just use crushing blow on yer act 2 merc. If you put 1 point in hex:siphon, it will give you mana and life per kill - and quite decent if you have enough +skills, you almost never need pots or insight if you're killing your way through - only when teleporting with enigma in large maps where you dont wanna stop to kill stuff will you need pots (or you get mana drained).