Well of Unmaking
The Well is rumored to have the ability to destroy lesser artifacts.
One of the groups adventures involved traveling to the well to destroy the Jewel of Zehir.
Little known to the group if the jewel was destroyed the Far Realm would permanently be attached to the mortal world.
The two groups met up at the well and fought a bloody battle against the guardians of the well and the forces of the Tor Siri in the end the Jewel was saved and the Tor Siri defeated. The head of the order, Ixalal escaped back thru the portal to his Citadel of Odanis.