It would maybe be a good idea to have a follow up version of the Realm after we defeat Hammurabi.
An idea would be to have a new Realm gate spawn with an harder variation of regular one. Harder bosses, harder trash mobs, harder challenges and a ascended final boss when you manage to close it. And of course better loot.
Also the gate could have a different color or design, and only one be able to exist at one time. Of course with at minimum a regular Realm for players to go.