The Spook was a very prominent Bronze Age villain but after the Crisis just faded into obscurity. I think most people will remember him as the bad guy Damian decapitated.
This. The Spook is basically Batman's version of Mysterio. He has a LOT of potential.
And, ugh, don't even remind me of Damian killing him. So glad that annoying little shit is dead (hopefully, for a long time to come).