Blood Lords… once they get their swing speed up, their swing animation stops and all you see is the swooping lines. The next thing you realize is your dead. How often have we seen a Baal teleporter death message because of these guys.
Stygian Dolls… I hate any mob that does more damage to you when they die then when they are alive. The fact that I die to these guys not because they kill me, but because I kill them and they explode, is one step short of infuriating.
Any unique/boss that has super speed and mana burn. You can’t get away to pop a mana potion because they are bouncing off you draining 100% of your mana every half second. This is an insta log off for me.
They are fun to fight as a frenzy barb though. Walk up to them and see who swings wildly faster. I usually win now with ebotd but when I was using grandfather+passion it was a pretty even fight heheh.
These really are my most hated entity in diablo 2. Extra fast extra strong fanatacism dolls give me nightmares.
Mana burn in general is scary. It was the thing that killed me more than any other single mod when I was whirlwind barbing. After switching to frenzy it is not so bad though.
I will add:
Lightning enchant, aura enchant (conviction) multiple shots/extra fast bone mages absolutely destroy my barb the few times I have seen it. Conviction in general combined with a lot of elemental damage is about the last thing that makes me worried I might get one shotted.
Stygian dolls are top enemy for any caster/range attacker (strangely enough zealer can chop them with zero problems). Say for most chars burning souls are … annoying even if you pile up to 90 lighting resist. To surprise some of you I’ll also nominate doom casters when they hit you damage amplify or lifetap its extremely annoying as well
For barb, you can duel wield your best, then have stormshield and a 3rd weapon on swap - takes care of dolls. Same for blood lords if they are a nastier than usual group.
T-Gods makes souls damage useless.
Hell Temptress with physical immune is kind of the last annoyance for me. back in the day, I use to teleport in the crowd, merc procs decrepify, ww - dead. I may try lawbringer at some point to deal with them. Gonna be a long time before I get enigma…
Tomb Vipers. At best you kill them before they spit, at worst you die, and about 33% of the time they kill your merc no matter how fast your shift+100% rejuv. Now the reason is twofold. One the poison is physicals dam, and two the tick rate is broken, it dumps all the damage in less than .5 sec per movement animation thought the cloud. I hunt a full key set every day, I take a headache pill before doing D keys.