Minecraft wiki entry for End_City, associated text: End cities consist of tall skyscraper-like towers constructed out of end stone bricks and purpur blocks. An end city may generate as a single tower by itself, or as a sprawling complex of inter-connected towers and pathways branching from a main tower. End rods and Ender chests are the only source of light. Many shulkers spawn around the city, and guard its various treasures. Decorative banners hang at the tops of some towers.