Drefia Grim Reaper Dungeons

To get in there you must go to Drefia. Near the centre of the mountain wall, there is a little ruin that has a Zombie inside of it. You will need Levitate or Parcels to get there. Go down the stairs where you will face a few floors of minor creatures until you enter a room with wide sandstone stairs. Down these stairs are the Grim Reaper Dungeons.

Use Fire Bombs or Magic Walls to keep the Grim Reapers away from shooters and healers. Mages and paladins can use these runes to make creatures run around the fields.