What does this information mean?
The former access quest is no longer required to enter.
The entrance you arrived through will (somewhat oddly) take you back to the docks of the Enchanted Lands. To return to Runnyeye, use one of the circular exits in the floor.
Go left from the zone-in and clear the trash. The two minotaurs near the vaults are linked with a rune covered chest. Kill the chest, and it drops a star shaped key that you need to access the next section of the zone.
Wait in that room for a bit for Vault Curator Ashuk and his assistants ( Assistant Curator Skint, A Gorehorn boar handler and three warboar ravagers), then kill them.
Head north and unlock the door. All the monsters in this room are initially set as NPCs. Walk in and wander around to trigger a ring event.
First ring - four Gorehorn elite guardsmen.
Second ring - three Runnyeye deathguards, an Oculus mender, and Seneschal Piknin
Third ring - Overlord Baylzuthak
After Overlord Baylzuthak is dropped, Duke Zoryll will say something about finding treasure in tunnels to the south - he's referring to The Chamber of Rulgax