MONOCULUS

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This article is about the boss. For the cosmetic item, see MONOCULUS!.
For the spell, see Magic spells.
MONOCULUS
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Monoculus normal.png
Kill Icon
Killicon monoculus.png
Basic Information
Health: Level 1: 8,000 + (total players - 10) * 400[1]

Level 2 and up: 17,000 + 3,000 * (level - 2)[1]

Damage Done: 150
Affected By:
• Battalion's Backup: Yes
• Bonk! Atomic Punch: Yes
• Candy Cane: No
• Chargin' Targe: Yes
• Dead Ringer: Yes
• Gunboats: No
• Mini-crits: No
• ÜberCharge: Yes
Found On: Eyeaduct, Hellstone, Brimstone, Gravestone, Slasher, Bloodwater
“
...Everyone thinks I'm just a one-eyed bloody monster...
Click to listen
— The Demoman lamenting his eye
 ”

MONOCULUS is the RED Demoman's missing eye, haunted, and grown to monstrous size by the Bombinomicon. It was summoned by Merasmus when the RED Soldier broke his staff. In the Bombinomicon comic, it is depicted as a large brown floating eye that fires purple rocket-like eyeballs.

Behavior

Spawning

MONOCULUS only spawns when at least 10 players are on the server and assigned to a team (however, this value can be controlled using the console command tf_halloween_bot_min_player_count). For 2 seconds[2] after spawning, any player standing within 250 Hammer units of where MONOCULUS spawns is knocked away. Any player that is within 100 Hammer units is killed instead.[3] If MONOCULUS is level 2 or higher, it also removes any stickybombs around it. Additionally, the kill radius is increased to 200 Hammer units.[4]

By default, players have 2 minutes to defeat it or it escapes, but this can be increased or decreased with the console command tf_eyeball_boss_lifetime. MONOCULUS's remaining health is displayed as a bar in a box near the top center of the screen. It fires eye-shaped projectiles that are guaranteed Critical hits. When enraged, it shoots three of these projectiles in quick succession. Its projectiles can be deflected, similar to other projectiles.

Teleporting

Every 10-15 seconds[5], it teleports, leaving a swirling, purple vortex where it last was. The portals attract nearby players to help them with entering the portal. Upon entering the vortex, they are taken to the Underworld. Upon exiting the Underworld, the player is ÜberCharged, Crit boosted, overhealed to 200% of their maximum health, and receive a speed buff.

Stun

Damaging MONOCULUS while still under the effects received when leaving the Underworld stuns it and causes it to sink to the ground for 5 seconds[6] and start groaning. In this state, MONOCULUS can only receive a third of its maximum health in damage.[7] After the 5 seconds have passed, it becomes enraged for 20 seconds.[8]

Rage

MONOCULUS enters a state of anger for 5 seconds if the last damage dealt was a Critical hit or if the average damage dealt over the past 5 seconds exceeds 300[9], and for 20 seconds after waking up from its stunned state. In this mode, the eyeball projectiles' speed matches the Rocket Launcher's rocket speed and MONOCULUS flawlessly leads its targets until it calms itself. When it is angry, its iris changes from brown to a bright red colour as well as its skin which changes to a light brown. Additionally, it has an extra "grumpy" state in which the projectiles fire faster[10], it looks around slightly more upset and faster compared to its calm state, and overall look slightly more angry. This state is only triggered if MONOCULUS is currently not enranged and its current health is lower than 2 * max health divided by 3.[11]

Resistances

MONOCULUS resists 50% of all Critical damage, resulting in Critical hits dealing double damage as opposed to the usual triple damage. MONOCULUS also has a natural 75% damage resistance against Miniguns and Sentry Guns (both bullets and rockets), as well as a 50% damage resistance against Flame Throwers[12]. However, damage fall-off and ramp-up are completely ignored, meaning a successful hit always deals the base damage of the corresponding weapon. Thrown weapons, such as Mad Milk, bounce harmlessly off MONOCULUS.

Upon defeat

Upon MONOCULUS's defeat, it slowly descends before exploding into Jarate, soaking any nearby players. Defeating MONOCULUS on Eyeaduct automatically grants the "Optical Defusion" achievement, which gives the player the MONOCULUS! cosmetic.

Voice

MONOCULUS speaks a voice line every 3-5 seconds[13] and every 1-2 seconds when enraged.[14] If MONOCULUS teleports, cannot find a target, and recently killed a player it will laugh.[15] All MONOCULUS voice responses are slowed down versions of Demoman responses.

Levelling

MONOCULUS initially spawns at level 1, at which its health is calculated using 8,000 + (total players - 10) * 400.[1] Upon MONOCULUS' defeat, it will come back one level higher the next time. If MONOCULUS escapes, its level will reset. The health for MONOCULUS at level 2 and higher is calculated using 17,000 + 3,000 * (level - 2).[1] At level 2 and higher, the range at which MONOCULUS kills players when spawning is doubled[4] and nearby stickybombs are fizzled out.

Strategy

Main article: Community Eyeaduct strategy
Main article: MONOCULUS match-ups

Related achievements

Monoculus angry.png Eye-chievements

Optical Defusion
 Optical Defusion
Kill MONOCULUS!

Reward: MONOCULUS!


Leaderboard class scout.png Scout

Foul Territory
 Foul Territory
Cause an environmental death by stunning or slowing an enemy.
Fall Classic
 Fall Classic
Cause an environmental death or suicide using the Force-A-Nature's knockback.


Leaderboard class soldier.png Soldier

Death From Below
 Death From Below
Kill 10 opponents who are airborne with the Direct Hit.


Leaderboard class pyro.png Pyro

Dead Heat
 Dead Heat
Kill an enemy in the same second that he kills you.


Leaderboard class demoman.png Demoman

He Who Celt It
 He Who Celt It
Use the Sticky Launcher to kill an enemy player via environmental damage.


Leaderboard class heavy.png Heavy

Crock Block
 Crock Block
Survive a direct hit from a critical rocket.

Update history

October 27, 2011 Patch (Very Scary Halloween Special)
  • Introduced MONOCULUS to the game.

October 28, 2011 Patch

  • Fixed a client crash that could occur while loading the map if MONOCULUS is killed or stunned.
  • [Undocumented] Fixed shooting MONOCULUS with bullet-firing weapons leaving the decals of impacted concrete.

November 2, 2011 Patch

  • MONOCULUS receives a faster firing rate and higher HP each time he respawns. This is indicated by levels.

September 4, 2012 Patch

  • Fixed Monoculus health bar not showing when Monoculus spawns.

November 2, 2012 Patch

  • Updated the health bar for Merasmus and Monoculus.

November 10, 2016 Patch

  • Updated the spawn/death sounds for Monoculus and Merasmus to remove the Horseless Headless Horsemann sound effects.

June 21, 2022 Patch

  • Fixed laggy animations on Halloween bosses, skeletons, ghosts and other ghoul-like beings.

Bugs

  • If two players from different teams enter the Underworld portal at the same time, both may get stuck in mid air after teleporting. They get un-stuck if either player dies or commits suicide.
  • If MONOCULUS is not defeated and leaves, its health bar may persist on the HUD.
  • When MONOCULUS is active, the message telling players the point cannot be captured says "Waiting for teammate", which is incorrect.
  • Killing someone with a deflected eyeball projectile still counts as a MONOCULUS kill.
  • Being killed by standing on the control point when MONOCULUS emerges or from a pumpkin bomb detonated by its eyeball projectiles counts as a suicide/environmental death.
  • If a player hits one of the MONOCULUS projectiles with a Sandman's ball or Wrap Assassin's bauble, it freezes the projectile in place.
  • The game does not log that a building is destroyed by MONOCULUS.

Trivia

  • Mono is Latin prefix meaning 'one', and Oculus is a Latin root meaning 'eye', so "MONOCULUS" literally translates to 'one eye'.
  • MONOCULUS recalls The Mighty Thor 292 (February 1980), If an Eye Offend Thee...! wherein Odin's Eye is introduced as a giant disembodied floating eyeball shooting forth jets of fire. See also: Odin reference in War!.
  • In The Naked and the Dead (Page 91-92), the Medic describes multiple instances of Demoman's eye turning into a monster that differ from MONOCULUS' appearance in-game, specifically: growing bat wings, "dracula," "brain-in-a-jar," and "knife-wielding ventriloquist dummy" eyes.
    • The Medic also references a time where MONOCULUS went back in time and tried to become the Mercenaries' parents.
  • In Helltower, the "invokum monoculus" spell summons a ghostly team-colored MONOCULUS that begins to attack enemies. Should both teams summon a MONOCULUS, they may attack each other.
  • Upon typing ent_create eyeball_boss in console while sv_cheats is turned on, the BLU Helltower version appears and only attacks the RED team.
    • ent_create eyeball_boss teamnum 2 makes a RED MONOCULUS, and ent_create eyeball_boss teamnum 5 makes the original MONOCULUS.
  • The code responsible for enraging MONOCULUS upon being hit by a Crit has a comment stating "critz piss me off", while the code responsible for enraging it if the average damage in the past 5 seconds exceeds 300 has a comment stating "heavy DPS pisses me off".[9]

Gallery

  • An angry MONOCULUS.

  • MONOCULUS' eyeball projectile.

  • MONOCULUS as it appears in the Bombinomicon comic.

  • Message that appears when MONOCULUS spawns.

  • Message that appears when MONOCULUS is defeated.

  • Message that appears when MONOCULUS leaves.

  • Message that appears when leveled MONOCULUS spawns.

  • Message that appears when leveled MONOCULUS is defeated.

  • Message that appears when leveled MONOCULUS leaves.

See also

References

Pictogram comment.png Every reference is prefixed with game\server\tf\halloween\

  1. ↑ a b c d eyeball_boss.cpp:L178-193
  2. ↑ eyeball_boss\eyeball_behavior\eyeball_boss_emerge.cpp:L65
  3. ↑ eyeball_boss\eyeball_behavior\eyeball_boss_emerge.cpp:L110-144
  4. ↑ a b eyeball_boss\eyeball_behavior\eyeball_boss_emerge.cpp:L113
  5. ↑ eyeball_boss\eyeball_behavior\eyeball_boss_idle.cpp:L122
  6. ↑ eyeball_boss\eyeball_behavior\eyeball_boss_stunned.cpp:L15
  7. ↑ eyeball_boss\eyeball_behavior\eyeball_boss_stunned.cpp:L29
  8. ↑ eyeball_boss\eyeball_behavior\eyeball_boss_stunned.cpp:L44
  9. ↑ a b eyeball_boss\eyeball_behavior\eyeball_boss_behavior.cpp:L69-79
  10. ↑ eyeball_boss\eyeball_behavior\eyeball_boss_launch_rockets.cpp:L35-40
  11. ↑ eyeball_boss\eyeball_boss.h:L315
  12. ↑ eyeball_boss\eyeball_boss.cpp:L333-347
  13. ↑ eyeball_boss\eyeball_behavior\eyeball_boss_idle.cpp:L24
  14. ↑ eyeball_boss\eyeball_behavior\eyeball_boss_idle.cpp:L205
  15. ↑ eyeball_boss\eyeball_behavior\eyeball_boss_idle.cpp:L166
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Monoculus angry.png Very Scary Halloween Special
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