Minecraft wiki entry for Speedrun, associated text: In a bastion, you generally want to aim for: at least 16 ender pearls (for the end portal and travelling), 21 obsidian (for blind travel and travelling in the Nether and for the one cycle), string (to make extra beds), fire resistance potions (for the blaze fight), and crying obsidian and glowstone (to make respawn anchors). If you don't have enough of these items after bartering all of your gold, find chests and loot them. Once you have all the needed items, leave the bastion. The bastion process is very quick; while the average player can do it in four minutes, skilled runners can do it under two minutes, and possibly even under one minute.