Iron Golem

Iron Golems are large, 3 block-high, strong utility mobs. Their main purpose is to defend Villagers in NPC Villages from hostile mobs and siege attacks.

Creation
Iron Golems will automatically spawn in NPC Villages naturally, provided there are 15 villagers. It does not have to be a naturally generated Village; as long as there are 15 villagers and a house, an Iron Golem will spawn.

The player may create them using blocks in a similar fashion to Snow Golems. To do so, the player must place 4 blocks of iron in a T-shape, and then place a pumpkin or a Jack-O-Lantern on top. This is equivalent to 36 Iron Ingots, making creation somewhat of a task. They will always spawn facing south.

Behavior
Iron Golems roam in villages rather slowly. When provoked, Iron Golems will move toward their target at a faster rate, swinging their arms up violently once in range to attack. This does 3½ to 10 hearts damage to their target and flings them into the air. They can take damage from lava, fire, poison, and drowning. They do not take fall damage. Upon death, Iron Golems drop three to five iron ingots, and sometimes one or two roses.

Iron Golems are able to hold roses and give them to Villagers, symbolizing the friendly relationship between the Villagers and Iron Golems.

Iron Golems will attack all hostile and neutral mobs if any come within their sight, except Creepers, Slimes, Magma Cubes, Wolves, and Ghasts. Iron Golems likely do not attack Creepers because of Creepers' destructive nature, which may destroy sections of the village. They will attack the player if the player attacks them first, or if the player attacks a Villager (only in Survival Mode). The Iron Golem does not have to directly see the player attacking a Villager to become hostile toward the player. They do not despawn if the difficulty is switched to peaceful and will continue to attack the player.

Iron Golems have a larger than normal attack range, this causes them to be able to attack through a solid 1 block thick wall, even without line of sight to the target. If an Iron Golem generated as part of an NPC Village is killed, another will eventually spawn to take its place.

Defense
An Iron Golem's primary purpose is to defend NPC Villages from Zombie attacks, usually during a siege. When attacking, they swing their arms as if tossing the enemy upwards. The enemies are thrown into the air and normally are killed in one or two attacks. Player usage might involve enclosing Golems in a large fenced-off area to prevent their wandering off, although such control of the area could be accomplished in simpler ways.

Farming
It is possible to make a completely automatic iron farm by building a "house" for NPC villagers to spawn in. If an area is made where only golems can spawn in, then a trap can be set up to obtain the golem's drop items. If you consider making a trap, make the inside of the house 2 blocks high. Golems can only spawn in areas that are 3 blocks high, so you can control where golems spawn. Glass panes, for example, can be used to separate the villagers from the golem spawning area. When a golem spawns, it should always spawn in the same place. From there, you can lead it to your trap (using pistons if necessary).

There are two ways to kill Iron Golems and obtain their drop items:

Drown the golem in water. Golems can't swim, so they will drown. This trap must be at least 3 blocks deep (since the golems are 3 blocks tall) Use water to push the golem into lava. A picture is shown at the right.

Both traps should have a collection area, where the player can pick up the drop items. It is possible to have multiple golems spawn in one area to make a very effective farm.

Another kind of farm uses water to drown Iron Golems. This is rather costly and time consuming to make, but is very satisfying, and with enough villagers, can quickly produce iron ingots.

If a player is short on resources and time but still wants to harvest the iron from Golems, they can simply suffocate the Golems with blocks of sand or gravel. Golems are very slow-moving and tend to wait at the same spot when not patrolling a village, so it is very easy to drop 3 blocks of sand or gravel on top of them and wait for suffocation.

History
Iron Golems were first introduced in Snapshot 12w08a.

Bugs

 * When creating Iron Golems in a 3 tall area (the pumpkin directly against the ceiling), the block directly above the Iron Golem will break.
 * If an Iron Golem dies in lava, the block(s) of lava where it died in will be removed and the lava will not flow into those blocks even when they are filled with another block and it is removed.
 * If an Iron Golem attacks a group of Zombie Pigmen, the whole group won't turn hostile towards the Golem, only the one attacked.
 * If an Iron Golem falls into a 3x3 pit of water, it will spin rapidly.
 * An Iron Golem riding a minecart will ignore everything, even if a target is in attack range.
 * Hostile mobs do not attack the Iron Golem until the Golem attacks them.(might not be a bug)
 * An Iron Golem can spawn in a 2 block high area if the block above the two air blocks is glass.
 * An Iron Golem can spawn on half slabs and fences.
 * For some reason, an Iron Golem can swim out of a water pit in a case like this:

Trivia

 * As the population of a village increases, more Golems will naturally spawn.
 * Castleintheskyrobot.png Iron Golems holding out roses to Villager children is a reference to the ancient robots in the Japanese anime movie Laputa: Castle in the Sky, as is the fact that the Golems are covered in vines.
 * When Villager children notice the rose in its hand, they will slowly approach, and take the flower eventually.
 * As with Snow Golems, the pumpkin must be placed last during the crafting process.
 * Also as with Snow Golems, there is no Spawn Egg for this mob. This is because the player can create them through other means.
 * It is implied by their looks and natural generation location that the Golems were created by the Villagers for defense.
 * Unlike other mobs (apart from the Magma Cube), Iron Golems will sink to the bottom of any liquid.
 * Iron Golems will avoid water whenever possible.
 * Iron Golems do not take damage when making contact with water (in contrast to the concept of iron rusting in the presence of water), but can still drown in the water.
 * When created, an Iron Golem spawns with a snow particle effect.
 * There is no maximum number of Iron Golems allowed per village.
 * Despite being crafted with a pumpkin head like a Snow Golem, the Iron Golem's head is made of iron instead of a pumpkin.
 * Iron Golems wobble as they walk, unique to other mobs which remain completely upright when walking.
 * Tamed Wolves will not be attacked by the Iron Golems if they are focused on the player.
 * Iron Golems have the second highest health points in the game, after the Ender Dragon.
 * The iron golem is the first mob that has its own attack animation with moving appendages.