Heroes Battle

I understand. You don't need to go there right now. Go to the Dungeon, to the Dark Elves and Demons. Through the portal. You captured the Dwarves, the Sylvan Elves, visit ALL the gates that the Dwarves have, go a little further past them, and the portal will activate. Then deal with the Warlocks and Demons below. After that, you'll end up above, at the place you mentioned; the script will activate, and the stones will be removed.