Zero

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ZeroDoomsday Construct
Zero (Ancients Awakened).png
Statistics
TypeBoss
EnvironmentThe Void
AI TypeZero AI
Damage50 / 69
Max Life350,000
Defense150
KB Resist100%
Drops
Coins55 Gold Coin
Zero Map Icon (Ancients Awakened).png
Map Icon
Strange Machine
Strange Machine (Ancients Awakened).png
Statistics
TypeEnemy
EnvironmentThe Void
AI TypeNo AI
Damage0
Max Life100 (Invincible)
Defense100
KB Resist100%

"ZER0 UNIT ACTIVATED. ENGAGE D00MBRINGER PR0T0C0L."

Zer0 is a post-Moon Lord, Ancient-tier Boss fought in The Void.

Spawn[edit | edit source]

Zer0 is initially found as a dormant Strange Machine in The Void. It can be found at any point in the game, but cannot be interacted with in any way.

Once the player has the means to do so, using the Doomsday Tesseract in The Void will activate the Strange Machine, which turns into Zer0. If Zer0 has already been defeated, it will simply summon Zer0.

Behavior[edit | edit source]

Zer0 acts like a sentry, with its weapons circling around it. As long as Zer0 has active weapons, its main body will be protected by an invincible shield.

  • Zer0 has 8 possible weapons it can start the fight with. Once summoned, it will use 6 random weapons.
    • Nova Focus, which fires a continuous death ray.
    • Genocide Cannon, a cannon that shoots deadly rockets.
    • Omega Volley, which fires rapid barrages of bullets.
    • Void Star, which fires a homing projectile that summons a "black hole" to suck in the player, holding them in one spot.
    • Reality Cannon, which shoots lasers.
    • Rift Shredder, which fires triangular projectiles that home in before exploding into a ring of lasers.
    • Gigataser, which shoots lightning bolts similarly to the weapon with the same name
    • Neutralizer, which fires three arrows at the player.
    • When a weapon is destroyed, it will become a Broken Weapon, which fires spreads of bolts.
  • When the weapons are destroyed, all previous Broken Weapons vanish, 5 Broken Weapons spawn, and Zero lowers its shield.
  • When it has its shield lowered, Zer0 will occasionally teleport to new locations around the player while using the following attacks:
    • Opens up and fires powerful beams along the cardinal or ordinal directions, signified by warning lasers.
    • Rapidly fires lasers at the player.
  • At 70%, it raises its shield again, and creates 7 of the possible weapons
  • Upon the defeat of the weapons, Zer0 lowers it again, and will have 6 Broken Weapons
  • At 33%, it will re-raise the shield, and have all 8 of its weapons.
  • Upon their defeat, it will have 7 Broken Weapons.

Quotes[edit | edit source]

Pre-Battle[edit | edit source]

  • "ERROR. PLAYER.GETMODPLAYER<AAPLAYER>(MOD).ZONEVOID == FALSE. PLEASE TRY AGAIN LATER." (When attempting to summon Zer0 outside the Void)

Zer0 Quotes[edit | edit source]

  • "ZER0 UNIT ACTIVATED. ENGAGE D00MBRINGER PR0T0C0L." (When Zero is summoned)
  • "INITIATING BACKUP WEAPON PROTOCOL." (When Zero regenerates its arms)

Post-Battle[edit | edit source]

  • "TARGET LOST. RETURNING TO ORBIT." (When the player leaves the Void during battle)
  • "TARGET NEUTRALIZED. RETURNING TO ORBIT." (When the player is killed)
  • "D00MSDAY PR0T0CALL MALFUNCTION. MAIN.EXPERT-MODE = FALSE." (When Zero is defeated on Normal Mode)
  • "DISTRESS SIGNAL RECIEVED." (By Infinity Zero after Zero is defeated)

Awakened Phase: Zer0 Protocol[edit | edit source]

Zero ProtocolDark Cipher
Zero Protocol (Ancients Awakened).png
Statistics
TypeBoss
EnvironmentThe Void
AI TypeZero Protocol AI
Damage167
Max Life500,000
Defense70
KB Resist100%
Drops
Coins3 Platinum Coin
Zero Protocol Map Icon (Ancients Awakened).png
Map Icon
Treasure Bag.gif Expert Mode-Only Content: This section applies only to Expert mode and Expert mode worlds.


"PHYSICAL ZER0 B0DY IN CRITICAL C0NDITI0N. DISCARDING AND ENGAGING D00MSDAY PR0T0C0L."

Zero Protocol is an Expert Mode exclusive second form of Zero. It has an entirely different AI from its non-expert phase, so extreme caution is advised.

Behavior[edit | edit source]

  • Zer0 hovers near the player, firing glitched blasts or rockets that slightly home. The blasts explode on impact, while the rockets pierce tiles and have much stronger homing abilities.
  • Zer0 frequently teleports to new locations, especially upon taking damage.
  • Fires 4 rays around itself, telegraphed by warning beams. Below 50% HP, this fires eight rays in a star pattern around itself.
  • Summons two rows of portals above and below itself that fire spaced vertical death rays after a delay. Alternatively, summons two columns of portals to the left and right of itself that fire spaced horizontal death rays after a delay. Below 50% HP, this summons portals all around itself that form a grid of lasers.
  • Fires several homing electric orbs that explode into bursts of electric bolts after a while.
  • Creates several "3CHO" clones around itself. Zer0 Protocol and the 3CHO enemies will all attack with X-shaped deathray bursts after a short delay to create a web of lasers. The clones can be destroyed before they fire, and will self-terminate after the attack ends.
  • After a short dialogue chain, summons four Zer0 Self Orgnazation minions. Zero will then fire a massive death ray at the player while each minion fires four sweeping deathrays around itself. The minions will then follow the player, teleporting around and firing 4-way lasers along the cardinal or ordinal directions.
    • Zero will not summon more minions if any Zer0 Self Orgnazation units are still alive.

Quotes[edit | edit source]

Pre-Battle[edit | edit source]

  • "ERROR. PLAYER.GETMODPLAYER<AAPLAYER>(MOD).ZONEVOID == FALSE. PLEASE TRY AGAIN LATER." (When attempting to summon Zer0 outside the Void)

Zero Protocol Quotes[edit | edit source]

  • "D00MSDAY PR0TOCAL ACTIVATED MANUALLY. TERMINATI0N SYSTEMS AT FULL P0WER." (Upon summoning Zer0 Protocol with an ERR0R_NULL)
  • "PHYSICAL ZER0 UNIT IN CRITICAL CONDITI0N. DISCARDING AND ENGAGING D00MSDAY PR0T0C0L." (When Zer0 is defeated in Expert Mode, commencing Zer0 Protocol)
  • "SELF ORGNAZATION CHARGING COMPLETE." (preparing to summon minions)
  • "BOOTING IN SELF ORGNAZATION MODE."
  • "ALLOW C:\TERRARIA\AAMOD\ZERO\PROTOCOL\SELF-ORGNAZATION.EXE? <Y/N>
  • [Y] (spawning Zero Self Orgnazation units)[sic]
  • === C A R N A G E === (firing lasers alongside minions)

Post-Battle[edit | edit source]

  • "TARGET LOST. RETURNING TO ORBIT." (When the player leaves the Void during battle)
  • "TARGET NEUTRALIZED. RETURNING TO ORBIT." (When the player is killed)
  • "DISTRESS SIGNAL RECIEVED." (By Infinity Zero after Zero is defeated)
  • "CHEATER ALERT CHEATER ALERT. NO DROPS 4 U" (When Zero Protocol is defeated on Normal Mode)

Notes[edit | edit source]

  • All of the projectiles from Zer0's weapons pierce tiles for the first few seconds of their lifetimes to prevent players from locking it in a box of tiles and blocking all its attacks. The only exception to this is the ray from the Nova Focus, which does not pierce.

Aftermath[edit | edit source]

  • Nulls start spawning in The Void, which drop Unstable Singularity; that can help you get them without keeping to fight Zero.
  • The background of The Void changes, and Infinity Zero appears as it is slowly approaching; it can be challenged when it is implemented.

Trivia[edit | edit source]

  • Zer0's theme is Entropy's Envoy, which was composed by the artist charliedebnam. This is a remake of Clockwork Catastrophe, created by OmegaFerretMusic.
  • Zer0 Protocol's theme is Doomsday Arrives, which was composed by the artist Saucecoie.
  • Zer0 was the first Ancient Boss and second Post Moon Lord Boss added to the mod, being added in Beta 0.3.
  • Zer0’s Design is based on The Fabrication Machine from the animated movie 9. Originally, however, Zero was going to be based on 0-2 from Kirby and the Crystal Shards.
  • Zer0 is actually one of many ZER0 units dispatched by an unknown entity.
  • Despite being labelled after Akuma and Yamata in game as well as on this wiki, it is only ordered this way due to being alphabetically placed after those two, and as such, Zero is meant to be fought at the same level as the chaos ancients, and as such, can be fought before those 2 without any major difficulty.
  • After being resprited 4 times, Zero's final resprite was made by Anoterontas.
  • Some of Zer0's dialogue is a reference to programming language.
Characters: Madness Slime (Ancients Awakened).png Pre-Hardmode Enemies • Elder Dragon (Ancients Awakened).png Hardmode Enemies • Null (Ancients Awakened).png Post-Moon Lord Enemies • Rajah Rabbit (Ancients Awakened).png Bosses • Lovecraftian (Ancients Awakened).png Friendly NPCs