Moon Lord

The Moon Lord is the final boss of Terraria and the endpoint of the whole boss-gated spine. He has the most health in the game (145,000 / 217,500 / 277,311 HP across Classic, Expert, and Master) and a moveset built to punish players who stand still. Beating him unlocks Luminite, his exclusive ore, which smelts into the components of the best armor and weapons in the base game. This is what every earlier tier has been building toward.

Getting to the fight

The Moon Lord comes at the end of the Lunar chain. After Golem, four cultists spawn at the Dungeon entrance; killing them summons the Lunatic Cultist, whose death begins the Lunar Events. Four Celestial Pillars (Solar, Nebula, Vortex, Stardust) appear across the world. Each drops Lunar Fragments that craft one of the four endgame class armor sets. When all four Pillars fall, the Moon Lord is summoned automatically after a short countdown. You can also summon him directly with a Celestial Sigil.

Farm the Pillars first. The fragments give you the class armor (Solar Flare, Vortex, Nebula, or Stardust) that makes the fight far more manageable, so clear all four before you commit to the Moon Lord.

The arena and prep

The Moon Lord flies and attacks across most of the screen, so you need room. Build a wide platform highway, several rows tall for vertical dodging, with wings and ideally a mount so you can keep distance while attacking. Line it with Campfires, Heart Lanterns, and Honey for regeneration, and set up Star in a Bottle if you are a mage.

Bring Super Healing Potions, the top-tier heal, and expect to use them. The Moon Lord out-damages lesser potions, and healing potions share the Potion Sickness cooldown, so time them rather than spamming.

Placing the Nurse NPC near your arena is a legitimate strategy: retreat to buy a full heal mid-fight when you have the opening.

How the fight works

The Moon Lord has three attackable eyes: one on each hand and one on the head. Attack their eyes to open them. Once an eye is destroyed it releases a True Eye of Cthulhu, which is invincible and keeps attacking you for the rest of the fight, so expect the screen to fill up as you progress.

When all three eyes are down, the core in his chest is exposed. That core is the real target and where you dump your highest damage. Watch for the Phantasmal Deathray, a sweeping beam from his top eye that will end an unprepared player instantly. Keep moving, keep your minions and ranged fire on the open eyes and then the core, and do not get greedy against the deathray.

Loot and endgame gear

Killing the Moon Lord drops Luminite plus a pool of endgame weapons. Luminite smelts only at the Ancient Manipulator into Luminite Bars, which combine with Lunar Fragments to craft the four best armor sets, one per class:

Class	Armor	Notable weapon
Melee	Solar Flare (highest defense, shield-charge dash)	Meowmere, Star Wrath, Terrarian
Ranged	Vortex (stealth)	S.D.M.G., Phantasm
Magic	Nebula (damage-stacking boosters)	Last Prism, Lunar Flare
Summoner	Stardust (guardian minion)	Stardust Dragon Staff

The Zenith and beyond

The crafting capstone is the Zenith, a melee sword made from a long chain of earlier swords including the Terra Blade, Meowmere, Star Wrath, and the Terrarian. It swings a cascade of every component blade and is the consensus strongest weapon in the game, effectively ending the power curve. Once you have it, most other endgame gear becomes optional.

For veterans, the remaining challenge is Master Mode endurance runs and optional superbosses like the Empress of Light (whose daytime enrage is a one-hit-kill test that rewards the Terraprisma) and Duke Fishron. Past the Moon Lord, the community meta often moves to mods like Calamity and Thorium via tModLoader, but that is outside base-game scope.

Related: for the full run that leads here, see the boss order cheatsheet. For the class armor and accessory systems, see classes and accessories.