Minecraft wiki entry for Defeating_an_End_city, associated text: You should bring blocks that you can use to block up rooms or tower or build bridges. You don't have to bring them, because of end stone everywhere. Mining purpur blocks around the end city can also help. Keep in mind that you can bridge double the distance by crafting end stone into end stone bricks and then slabs. Or bring extra wood: a stack of logs converts to 8 stacks of slabs!