Rathbreaker Bug??

The boss is also just unbeatable... Only option is to run away sometimes, which breaks the fight.

I'm experiencing this right now - googled it and it's quite common apparently - reddit referred me to this forum and found this thread throughh a search. I guess I'm resetting the instance as many have suggested.

This just happened to me, too. He just stands there, doing nothing, absorbing / healing all the damage I do to him for as long as I want to dish it out (until I run out of mana).

Can confirm as well. Just cheesed him by accident, wanted to report and saw that others already noticed.

I first lured the minions / wolves down the hill because I thought he would come down as well. He did not and the wolves didn't stop spawning which is why I returned to him on the hill. From then on I was just able to roll around him dealing damage. He did not do anything apart from his normal swings.

Addition to my post above: seems like I read through the thread too quickly without realizing people are describing something different from me.

My "issue" was that I could cheese the boss, not that I was unable to deal damage.

Same issue, followed one of my minions off the platform to the valley below and now it is standing still/being immune and regenerating life after taking damage.

Bug Report ID: #2537001750

Had the same issue happen to me, doesn't seem like it resets fully.

+1 Kited Rathbreaker off the cliff and he resets with heavy regen

+1 Happened to me too.

Happened to me as well