I have been fighting lederer in level 412ish on mythic 3 and I cannot get it’s health to drop after 20 solid minutes of running around and not dying. Am I doing something wrong or could there be an unwinnable boss? I’m blowing millions every respawn now. Any help would be greatly appreciated
You played at map with " + enemy heal". When I see this on map, I use Larimar. 
those things usually have billions of HP
Thank you for the help!