The oh so subtle title of Dark Nights: METAL: Dark Knights Rising is a good indicator of what you‘re in for.
This book collects 7 brutal and often grisly tragedies from 7 different worlds of the Dark Multiverse. On each world Bruce Wayne went bad in a different way, often murdering millions. Now this league of evil Batmans sets its sights on the regular old Multiverse where our heroes reside.
Good, if you don‘t mind unrelenting darkness.