This is the best Black Knight story ever. Which is to say, it’s a story about Black Knight and it doesn’t completely suck. I hate Black Knight. But Roger Stern and Paul Smith can make anything worth reading.
He was restored to human form in Avengers #226, and since then he’s been having PTSD from multiple centuries of bloody battles, which are basically caused by an old Merlin curse that enslaved his ancestor, an earlier Black Knight. Umar is also involved.
The curse is lifted in the end.