: You can "stack" an infinite number of mobs in a single block without them taking "entity cramming" damage, allowing you to AFK for 15+ minutes and then kill hundreds at once for massive XP drops. Blaze Farms
: Essential for the killing chamber to prevent babies (zombies) from escaping and to let you hit mobs' feet without them hitting back. minecraft 1.7.10 xp farm
: A 9x9 room around the spawner ensures maximum spawn rates. 1.7.10 Strategy : You can "stack" an infinite number of