I've updated the mod to fix the D'Sparil BOSSDEATH special bug and to add a couple of mutators to play with Doom or Heretic monsters only. This was an engine bug and apparently only happens with certain versions. Tested with GZDoom 2.4.0 and 3.1.0, QZDoom 1.3.0.1 and 2.0, ZDoom32 2.8.2 and ZDoom LE 2.8.1a.
Romero's Heresy II update