Demon Wars World Change/Spoiler

To reach this place you need to go to Edron Hero Cave and follow the way to Vampire Shield Quest.

If you go through the portal you will get in a safe room with the npc called Dark Priestess.

The room also contains stairs, which will lead you to the middle of the Demon Wars cave.

To the East the Askarak Demons rule usually. To the west the Shaburak Demons rule normally.