Dragonslayer Armor - Dark Souls 3 Boss
I really liked this boss; turns our jolly cooperation actually hurts you!
I manage to solo the Dragonslayer Armor, though I was unable to beat it on my first try namely because my summons were little help/unlucky and Knoah distracted me...
It gave me to same feeling that the Blood-starved Beast did: I felt like I knew what I was doing; that I had actually gotten good.