More info: I found this comment on reddit.

"To confirm avoiding stasis ailment and aether seems to let you kill him.

I had to swap annihilation over to poison damage, remove anomaly from my, build, and remove the modifier that adds stasis to the teleport skill, and that fixed it.

Took forever to kill him with a subpar build but.. it worked. Switch down to story difficulty as well to reduce his HP."

Me and my wife got stuck on this bug as well. We basically had to stop playing to wait for a fix. Hopefully a fix comes soon.

Please give us a patch for that bug, alot of people have problems with that, including me now, tryed many times, but its the same every time, in hes second fase, something happends, and he do not take damage or move.

Hello:

This is what i found on reddit : https://www.reddit.com/r/Wolcen/comments/f7r4ri/heimlock_bug_freeze_invincible_takes_no_damage_or/

It's seems for the comments in there that the bug is with certain mechanics, like aliment and aether damage. Seems like for example warriors tank dosen't have that problem.

People on reddit is working arround their kills not to make him get bug, wich is not the idea of a great gameplay experience.

Myself now, as a totally caster mage , im trying to lvl up other skills to see if they dont make him BUG.

What i heard guys is that you can also can make a try, change to "story mode" to decrease the boss total health and make him easier to take. But well i hope wolcen studios can find a fix for this fast, so we can move on with the game.

Actually the user "Belsor.6588" is offering help freely to kill the boss. Seems like he help 50+ more people to killing him. You just had to add him and he will kill it with you fast before he got bugged. I'm trying to find him, but he seems not connected.

If any one can kill him easy and freely offer his help i will be glad to accept
My tag is: hitokkiri.0962

Thanks you all

Also, dealing with this bug, Please fix.

Same problem here, i quit the game and restarted the fight 5 times, and the end result is the same at the second phase he stops moving and does not take any dps from any sources. You should change the name of the game to wolcen lords of bugs. Fix this

Hello guys :

I found this 2 threads that could help us:

1) https://wolcengame.com/forum/gameplay/gameplay-help/confirmed-workaround-for-act-3-boss/
2) https://steamcommunity.com/app/424370/discussions/0/1744519865919348695/?ctp=15

Im waiting for some one to "taxi service" me trought act 3 .

pd: ill tried in story mode and it was being easily i manage to reach phase 3. FOR ME, looks like the "inmovilization/stun" skill is what made him bug. So DO NOT USE aniquilation, or anomaly, or aethereal jump, i was using fireball, normal hit, and some ice rock that fall from the sky. Seems too that NOT HITTING HIM when he is transforming is another key to make it work. When he is changing to his ascended mode, stop damage him until he start runing again.

Big hugs!

I'm so tired of this game and it's bugs. I finally got past the not being able to enter the zone by joining someone else who had the next portal.
Now I hit this bug which again keeps you from progressing to end game. I think I'll start programming my own game if all I have to do is code like this shit. bug has been here for almost a week and still they haven't done shit.

CONFIRMEDDDDDDDDDDDDDDDDDDDDDDDDDD

belsor.6588 is even more broken then the boss.

He add me to help me killing him , he killed him in 10 seconds, all the 3 phases. HE IS A BEAST. Never seen anything like that before.

REALLY THANKS BELSOR, YOU SHOULD BE THE REENCARNATION OF ANATHEA

https://wolcengame.com/forum/bugs-issues/bug-reports/heimlock-bug-stuck-solved-proof-inside/#heimlock-bug-stuck-solved-proof-inside-2EgP