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Boss Progression

By ScotUpdated Sources checked

Tactical Quick Answer

Terraria bosses gate your progress, so clear them in order: the Eye of Cthulhu first, then the Eater of Worlds or Brain of Cthulhu depending on your world evil, then Skeletron to open the Dungeon. Each fight drops materials for the next tier of gear, including the pickaxe you need to mine Hellstone. Beating the Wall of Flesh in the Underworld ends Pre-Hardmode and permanently flips the world into Hardmode.

Bosses gate your progress in Terraria. Defeating them unlocks new NPCs, new ores, and access to new areas. You cannot skip them. This guide outlines the recommended order to tackle the major bosses before the game permanently changes in Hardmode.

Pre-Hardmode Roadmap​

Your initial goal is to clear the early hurdles to unlock better gear. Start with the Eye of Cthulhu.

The Eye of Cthulhu​

This is typically your first boss. Each night it has a 1 in 3 chance of spawning on its own, as long as nobody has beaten it in this world yet, at least one player has 200 or more maximum health and more than 10 defense, and four or more town NPCs live in the world. The Old Man, the Traveling Merchant, and town pets all count toward that four. The Skeleton Merchant does not.

If you are not ready to fight it, strip your gear down to 10 defense or less before dusk and the roll never happens. You can also summon it by hand with a Suspicious Looking Eye, though only during the night itself, from 7:30 PM until night ends at 4:30 AM. Used in daylight it does nothing. Build a long, flat wooden platform above the ground to fight it. Running in a straight line while firing ranged weapons makes the fight simple. Defeating it drops Demonite or Crimtane ore.

Eater of Worlds or Brain of Cthulhu​

Your next target depends on your world type. If your world has Corruption, you fight the Eater of Worlds. If it has Crimson, you fight the Brain of Cthulhu. Head to the respective biome and smash three glowing orbs or hearts found deep underground using bombs or a hammer. The count runs across the whole world and not in one sitting, and the third one summons the boss immediately with no chance roll.

The orbs sit walled in Ebonstone or Crimstone, which your starting pickaxe cannot break. Bring bombs or Purification Powder, because the pickaxe that mines those blocks is the one this boss is going to drop you the materials for. You can also skip the orbs entirely by crafting Worm Food in a Corruption world or a Bloody Spine in a Crimson one, which summon the boss anywhere in the matching biome at any time.

These bosses drop Shadow Scales or Tissue Samples. You need these materials, combined with Demonite or Crimtane bars, to craft a Nightmare or Deathbringer pickaxe. This pickaxe allows you to mine Hellstone later.

Skeletron​

Head to the Dungeon on the far side of the map. Talk to the Old Man outside at night and select "Curse" to summon Skeletron. You can walk into the Dungeon's surface entrance safely. What kills you is depth: drop below zero depth without having beaten Skeletron and Dungeon Guardians spawn. They deal 9999 damage, carry 9999 defense, and fly through blocks at 41 miles per hour, so they kill you on contact and you cannot meaningfully fight back. Killing one does not open the Dungeon either. Skeletron is the only way in. The room you first drop into got a little safer in 1.4.5.7, which stopped Dungeon Pit Traps generating in the first room attached to the entrance.

Fight him early in the night. He can only be summoned once per night, and if he is still alive at 4:30 AM he enrages into a Dungeon Guardian clone and wipes your arena.

Skeletron requires high mobility. Build multiple layers of platforms and use a grappling hook to dodge his flying skull attacks. Defeating him grants full access to the Dungeon, which contains essential accessories and weapons.

Interpreting Cryptic Messages​

The game uses colored text prompts in chat to signal impending boss spawns or events. If you see the message "You feel an evil presence watching you...", the Eye of Cthulhu will spawn 81 in-game minutes later, at exactly 8:51 PM. If you are unprepared, drop below the Surface layer and stay there until dawn. Any layer underground works, but you have to remain down for the whole night. Come back up at any point before the night ends and it spawns as normal.

Entering Hardmode​

Once you have explored the Dungeon and mined Hellstone in the Underworld to craft Molten armor, you are ready for the Wall of Flesh.

The Wall of Flesh is the final Pre-Hardmode boss. To summon it, you must drop a Guide Voodoo Doll into a pool of lava in the Underworld, which kills the Guide. Every Voodoo Demon drops a doll when you kill it. The rarity is in the demon, not the drop, so build your bridge and farm Underworld demons until one appears. Be careful killing them over open lava, because the doll they drop will summon the boss by accident. Since 1.4.0.1 you can also skip the doll entirely and just let the Guide himself die in Underworld lava.

Before summoning the boss, build a massive bridge across the Underworld out of ash blocks or platforms. The Wall of Flesh sweeps across the screen from one side to the other, forcing you to run backward while fighting it. Touching the wall does not kill you outright. It costs 50 health on Classic, 100 on Expert, and 150 on Master, plus knockback that ignores your Cobalt Shield. The instant death is The Tongue, which grabs you if you get behind the wall or try to leave the Underworld and kills you once it drags you past about 187 tiles. And if the Wall reaches the edge of the world before you kill it, it despawns and every player still carrying the Horrified debuff dies on the spot. That is why the bridge has to be long.

Defeating the Wall of Flesh instantly activates Hardmode. The world immediately generates a massive diagonal stripe of Hallow and a new stripe of Corruption or Crimson. Hardmode introduces much tougher enemies, mechanical boss variants, and powerful new ores. The difficulty spike is severe. Prepare your base and farm necessary items before making the jump.

Frequently Asked Questions​

What is the first boss you should fight in Terraria?

The Eye of Cthulhu. Each night it has a 1 in 3 chance of spawning once at least one player has 200 or more maximum health and more than 10 defense, and four town NPCs live in the world. The Old Man, the Traveling Merchant, and town pets count toward that four, but the Skeleton Merchant does not. You can also summon it with a Suspicious Looking Eye during the night, between 7:30 PM and 4:30 AM.

How do you stop the Eye of Cthulhu from spawning?

Unequip armor to drop your defense to 10 or below before dusk. The condition is more than 10 defense, so sitting at exactly 10 is enough to stop the roll.

Should you fight the Eater of Worlds or the Brain of Cthulhu?

It depends on your world type. Corruption worlds get the Eater of Worlds and Crimson worlds get the Brain of Cthulhu. Smash three glowing orbs or hearts deep in the matching biome, and note they are walled in Ebonstone or Crimstone, so bring bombs or Purification Powder. Worm Food and a Bloody Spine summon them without any orb smashing.

What happens if you enter the Dungeon before killing Skeletron?

The entrance itself is safe. Going below zero depth spawns Dungeon Guardians, which deal 9999 damage and fly through blocks, so they kill you instantly. Killing one does not open the Dungeon. Talk to the Old Man outside at night and select Curse to summon Skeletron first.

What does the message about an evil presence watching you mean?

The Eye of Cthulhu will spawn 81 in-game minutes later, at exactly 8:51 PM. If you are unprepared, drop below the Surface layer and stay there all night. Coming back up before dawn lets it spawn as normal.