Eternal Knight mob seems overtuned

For me it's one of the best designed mobs in the whole game becasue it requires some tactic to be beaten and not being a meaningles 1-hit bowling pin like 90% of the trashmobs.

I would wish myself more of such mobs that require certain tactic to be killed.

This guy... you play a build where you press a single button and your attack kills everything behind, next to and in front of you on and off the screen and scales damage higher than most other skills in the game.

Fix your skill issue, maybe add a second button to your "rotation"