Skeleton Knights, Lucius and Ilgorr.
Zantai of course
2 Likes
Gargaboll is a classic. Otherwise, I don’t really die to non-celestial/nemesis enemies that often.
Grava-thul and other arcane enemies (especially pre arcane changes) have killed me a few times as well. One of my more painful HC rips was on a “immortal” battlemage that died to Grava’s arcane debuff when I looked away from my screen for a second 
On a related note, this is the HC kill tracker for season 7 of the GD community league. It’s a pretty healthy mix of the classic vanilla GD enemies and season only enemies: Grim League .
5 Likes
Don’t think so, he is very easy with enough dps and by charging him straight to the face. His dangerous skill which shred your DA activates when there is some distance between you, by meleeing him, he mostly auto attacking you
Please remove the link. It contains my shame, immortalised 
2 Likes
Skeletal Archer for levelling characters
2 Likes
I lost 3 chars to Morgoneth 
Obsidian Shard = Zaria I assume?
Seems all my mentions made the table. Though I am surprised to see the current version of Grava that high.
Sadly it’s not that specific. Zaria, Karroz, Naren Kur, all those ones I think look the same. But yeah, Zaria probably the biggest contributor
There are 2 kinds of shards, both sadly named the same:
This is the one bosses spawn (Zaria, Karroz and Naren Kur):
And this one is spawned mostly by Bloodsworn Void-Callers:
While the boss version hits harder than the non-boss one, running into multiple Void-Callers and having them all summon crystals can be even more dangerous than the boss version, if not killed quickly enough or outranged.
So it is indeed quite hard to tell. Would need the specific Shard ID to be sure it’s the bosses.
Current leader of hc kills for me is shared by two enemies. Bolvar and Rutnick have both killed two characters. Their burst potential during leveling is immense. These days I straight up avoid em.