Here are a couple of other suggestions on stuff to hunt with your dread warhorse and a nightmare, in no particular order:
- Demons and imps in the Hedge Maze.
- Imps, reapers, headless at the Justice gate area in Ilshenar.
- Demons in Wind.
- Wisps in the Wisp Dungeon and maybe wander around level 2 a bit.
- Sphynx in T2A.
- Dragons, drakes, wyverns, giant serpents in Destard.
- Ogre lords, cyclops, titans, acid elementals in Despise.
- Rotting corpses in Doom or Tokuno or Covetous.
- Blood Dungeon in Ilshenar for blood elementals and demons.
- Blood elementals, poison elementals, krackens, sea serpents, mages in Shame.
- Ki-rin or unicorn near Grimswind in Malas or near Spirituality gate in Ilshenar. (Take just one pet and tame the ki-rin or unicorn, release and kill for the leather.)
- Tsuki wolves, bake kitsune and kaze kemono in and near the Kitsune Woods on Homare-Jima island.
- Wyverns, imps, cyclops, titans in T2A.
- Lesser hiryus, ninjas, onis, bone mages, revenant lions, skeletal mages, kappa on Isamu-Jima island on the southern end of Isamu-Jima (i.e., the Hataka Plains, Citadel, Storm Point, and Lake Kappa area). You might have to avoid the sole hiryu that wanders the area, but otherwise it's a very large area with a variety of stuff to kill.
- Assorted monsters near the entrance of the Sorcerer's Dungeon in Ilshenar.
- Cyclops and titans in Ilshenar at the Cyclops Pyramid near the Honesty gate.