Glorious. Enough said.
Boys, just a heads up the portal room NPCs are very weak and you can quickly convert them into a zombie horde.
With the main city portal rooms being a high traffic area, you can definitely get some satisfying gameplay there and it can even be done solo due to the army you can quickly assemble.
Highly suggest zombie gameplay on a level 50 mage. You can reach every high traffic city with ease by teleporting yourself when infected.
Nowhere is safe!