Moro Dark Knight Problem
 

Moro's gone good! Now I can't make Dark Knights. In my whole current run there are 23 Dark Knights I can purchase but I can't make any more. Can I turn Moro Dark bad again? or is there another way to get Dark Knights?

Or is it time for another playthrough where I get Moro at the end when I need him?

Thank you for your advice!

You can get Dark Knights with the Necromancer in Montero mines, after you give him some dwarves.

Or you can use a Wanderer scroll and hope you get Black Knights.