"Hall of grandmasters" npc immune to damage bugged

It appears at least 2 of the NPC's in Hall of grand masters can not be killed by a player using spark and voltaic rift (unique bow).
Edit: I just tested with my level 1 off hands it has nothing to do with voltaxic and thus chaos damage , it must be spark cant hit the npc's?

Character I played on:
Colwyn_scion

Images: not that they really add anything (i did no damage and it was one of the first waves they did no damage:
http://imgur.com/a/kTDR5

The npc's were:
"haragejohnson"
"LatticeSixteen"
~possibly others

I will assume they are incorrectly either:
A) not on the ground (i know spark cant hit some things flying like animated weapons)
Its not that on further testing

Visually these are just 2 players on the ground, if its A thats a bug , they did very little damage to me (they are in the first 2 waves) and i was essentially unable to damage them.

I have sufficient dps for the encounter , i just stood there tanking the npc, and not being damaged by him really.

--

Anyway , took my much lower level , and geared RF totem in there and 1shot both of them, I believe this to be a bug. You can not continue in the instance if you do not kill all of each wave , bug with any one npc\mob means the encounter can not be completed.

Thanks

Colwyn

"

Vipermagi a écrit :

I'm guessing you're dealing entirely Chaos Damage?
Because, well, there's a way to be 100% entirely immune to Chaos Damage.
edit; ah, just saw the edit. Welp.
Aegis Aurora + Spell Block wouldn't work against RF Totems. That'd be my guess then?

Im not sure , I thought I was missing some mechanic, I cleared 1 wing fine , then on the next wing I was unable to damage one of the guys.

I tried with my off hands so i was then lightning damage and not chaos and still did no damage to him.

it was one of the first waves my rf totem 1 shot the guy.

Im going to run it again but ill take some other form of damage with me, for anything immune to spark damage ill take a 4 link with fire damage or something . If you are right and it was just immune to spell damage some how what would be a good 4link that i could use?

I have had a google and look at the wiki and dont think im missing anything it may be a new bug ?

did anybody resolve this? I too have 2 heros that take almost no damage where i one or two shot the rest of the other heros.

I switched from physical damage on my bow to mostly cold and fire and it made no difference.