Making the Ancient City Warden Portal Activatable

The large reinforced deepslate structure in the center of the Ancient City looks exactly like a portal framework. It would be amazing if this portal could finally be activated in a future update. For example, players could use Echo Shards or a new unique item dropped by the Warden to open it. This would lead to a brand new dimension, giving endgame players a great new challenge and a reason to explore the deep dark.