Golem

The Golem is a Hardmode boss. It is summoned by using a Lihzahrd Power Cell on the Lihzahrd Altar, which is found in the Lihzahrd.

The Golem has 2 phases and can be damaged in three places: the left fist, the right fist, or on the body just below the neckline (indicated by a glowing box and the damage indicator). The head is always invulnerable, but is important to avoid as it can deal damage by spitting fireballs or shooting lasers.

Important Note: The body hitbox is labeled as "Golem head" during Phase 1. When you transition into Phase 2, it will be labeled "Golem" while the head is detached and moving around the room.

During Phase 1, the Golem will shoot fireballs from the head, attack with the fists, and jump around; these abilities are timed and increase in frequency as each part takes more damage (when the fists are damaged, they will attack more often; when the body is damaged, it will jump/shoot lasers/shoot fireballs more often). When the body falls below half health, Golem will begin to shoot lasers from the head. This phase will last until the body of the Golem has taken full damage.

During Phase 2, the Golem's head will detach and fly above its body with increased speed while firing lasers at the player. It is identical to the previous phase without the fists.

Tips

 * At low health, the Golem will begin firing lasers faster, so ensure that you have a suitable number of potions. It will also extend its fists more frequently. Try to destroy these first so that they don't become a problem later.
 * The Golem only fires lasers during two parts of the fight, first when the head reaches 7500HP, but only if you move far enough for the head to turn to the side. After the head comes off and the body becomes vulnerable, the head will not shoot lasers until the body reaches 4000HP, but will then fire more rapidly as the Golem's health gets lower.
 * Being one of the two bosses that cannot phase through blocks (the other being King Slime), it is possible to beat Golem without incredibly good gear, and there are several ways to quickly kill it without much difficulty.
 * While exploring the Lihzahrd Dungeon, you can gather all the traps. Construct vertical pillars out of traps large enough for Golem but high enough for him to not get out on both sides of the altar. Finally line the ceiling with spike ball traps. After summoning Golem leave the enclosure and repeatedly activate traps to kill it.
 * Attacking incessantly with the Vampire Knives from close range while wearing high-end melee armor (Hallowed or better) will usually regenerate the players health faster than the Golem can damage. Although this requires taking large amounts of damage from the Golem, this can be mitigated by using Turtle Armor, accessories with the Warding prefix, and/or an accessory with the Cross Necklace effect.
 * You can place platforms in the room vertically, causing the Golem to spawn on top of the platforms and making it easier to dodge and attack from below. This method is very useful when using bouncing or seeking weapons while hiding under a protective roof between you and the Golem, so you can deal damage and only have to worry about the lasers. The roof method can also be done with melee weapons that fire wall penetrating projectiles (namely the Mushroom Spear, Death Sickle, Chlorophyte Partisan, and the Chlorophyte Saber).
 * Using the Bunny Cannon and a wall between you and the Golem, you can very easily take this boss out in a short amount of time. This takes about 50 explosive bunnies, just spam-click the cannon until it dies (tip: aim the cannon straight up and wait for the boss to stand on top of it).

Trivia

 * The Golem might be a reference to Kaos Karnage from Donkey Kong Country 3: Dixie Kong's Double Trouble
 * A "Golem" is actually an "animated anthropomorphic being, created entirely from inanimate matter" from Jewish Folklore.

History
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