Boss

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Boss
Attribute • Modifier
Similar Article
This article is about Boss. You may be looking for Boss Rush.

<infobox>

<title source="title1"><default>Boss</default></title><image source="image1"></image> <label>Type</label> <format>Enemy Type</format> <label>Variants</label> <label>Required Detection</label> <label>Immunities/Resistances</label> <label>Effects</label> <label>Available in Sandbox?</label> <format>✔ Yes</format> <label>Tag</label> </infobox>

Description

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Boss enemies are major bosses which generally spawn at the final wave. In some cases, an enemy may be considered a Boss enemy only for its first appearance. This gives it multiple immunities or resistances to various forms of stalling, even if these immunities are not visible under their health bar.

Mechanics

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Boss enemies are immune to multiple effects, with varying degrees of resistance:

  1. Freeze Immunity, making it fully immune to freeze and less affected by chillness.
  2. Stun Immunity; any period of slowdown is weaker on Boss enemies and prevents knockback.
  3. Immunity to poison slowdown, namely from the Toxic Gunner, Biologist and Poison Ducky, though it is still affected by poison damage or defense dropping.
  4. Immunity from the confusion effect when afflicted from a tower, namely the Jester's Confusion Bombs and the Biologist's Nightshade.
    • The confusion effect from the Confusion Ducky can still affect Boss enemies.
  5. Immunity to slowdown from the DJ Booth's purple Drop the Beat ability.
  6. Immunity to slowdown from the Harvester's Thorns ability (and by extension any thorns generated by Farms).
  7. Immunity to a damage type, the Nuke's fallout damage.
    • The explosion damage from the Nuke still affects Boss enemies.
  8. Boss enemies cannot have their defense dropped.
    • Due to a bug, burn and freeze defense dropping sources work on it. The Jester also works, but only on enemies which are not broken and allow it to reduce their defense.
  9. Immunity to being converted or slowed down by the Hacker.
  10. Immunity to being slowed down by the Slime Trooper.

Boss attribute also used to make enemies immune to these effects, but are not immune to them anymore:

  • When first added, Boss enemies were immune to being set on fire by the Pyromancer, to prevent them from being slowed down. This was removed in the Overhaul Update, as the Pyromancer no longer slowed down enemies.
  • When first added, Boss made enemies immune to the frost mark effect. This was removed in the Overhaul Update, as frost mark was removed from freezing towers.
  • Stun Immunity was originally Energy Immunity.

While Boss gives enemies some immunities, they are not always the same as the regular immunity. For example, the Boss Freeze Immunity only makes the enemies partially immune to chillness, unlike the regular Freeze Immunity which makes them completely immune to chillness.

Boss enemies are also immune to some enemy abilities. For example, the Fallen Jester cannot apply Bloated or Nimble to them while the Slime cannot transform into them.

Boss enemies take 1.4x more damage from bottom path Juggernauts starting at level 4B, and 1.5x more damage from maxed-out bottom path Juggernauts.

Boss enemies have a purple health bar appear at the top of the screen. Most sounds, with some exceptions like game music will also get quieter.

Enemy List

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The following enemies are currently a Boss enemy, with the Freeze Immunity, Stun Immunity, poison slowdown immunity, confusion immunity, fallout damage immunity, DJ Booth slowdown immunity, Harvester slowdown immunity, defense dropping immunity and Hacker conversion/slowdown immunity:

The following enemies are a Boss enemy for their first spawn, with the Freeze Immunity, Stun Immunity, Toxic Gunner slowdown immunity, confusion immunity, fallout damage immunity, DJ Booth slowdown immunity, thorn slowdown immunity, defense dropping immunity and Hacker convertion/slowdown immunity:

The following Sandbox mode only enemies spawn with Boss:

The following enemies once had Boss by default, but no longer have it:

The following enemies used to spawn as a Boss for their first appearance in a mode, but no longer do that:

The following event enemies were also a Boss enemy, with the Freeze Immunity, Stun Immunity, Toxic Gunner slowdown immunity, confusion immunity, fallout damage immunity, DJ Booth slowdown immunity, Harvester slowdown immunity and defense dropping immunity:

The following event enemies were a Boss enemy for their first spawn, with the Freeze Immunity, Stun Immunity, Toxic Gunner slowdown immunity, confusion immunity, fallout damage immunity, DJ Booth slowdown immunity, Harvester slowdown immunity and defense dropping immunity:

The following event enemies were also a Boss enemy, with the Freeze Immunity, Stun Immunity, Toxic Gunner slowdown immunity, confusion immunity, fallout damage immunity and knockback immunity:

The following event enemies were also a Boss enemy, with the Freeze Immunity, Energy/Stun Immunity and Toxic Gunner slowdown immunity:

The following event enemies were a Boss enemy for their first spawn, with the Freeze Immunity, Stun Immunity and Toxic Gunner slowdown immunity:

The following removed enemies were also a Boss enemy, with the Freeze Immunity, Energy/Stun Immunity and Toxic Gunner slowdown immunity:

The following event enemies were also a Boss enemy, with the Freeze Immunity and Energy Immunity:

The following removed enemies were also a Boss enemy, with the Freeze Immunity and Energy Immunity:

The following event enemies were also a Boss enemy, with the Freeze Immunity and Burn Immunity:

Tower & Unit List

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Although no known use on towers for this attribute exists, the following towers used to have Boss:

Update History

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  • 13 October 2019 - Release v1.0.0
    • Boss added.
  • 29 October 2020 - Overhaul v1.0.0
    • Boss now gives enemies a purple health bar appear on top of the screen.
    • Boss now gives enemies Energy Immunity.
    • Boss no longer gives enemies Burn Immunity, as the Pyromancer no longer slows down enemies.
    • Boss no longer makes enemies immune to frost mark, as that effect is no longer applied by any tower.
  • 8 May 2021 - Overhaul v1.3.0
    • Bug: Boss health bars from defeated Boss enemies prevent health bars from Boss enemies that appear later from being in the same spot as them, making health bars for Boss enemies that debut later appear lower on the screen than intended.
  • 4 July 2021 - Overhaul v1.4.0
    • Boss now makes enemies immune to poison slowdown.
  • 31 October 2022 - v1.4.2
    • Bugfix: Boss health bars now appear correctly.
  • 7 April 2023 - v1.7.0
    • Boss is now displayed under an enemy's regular health bar with the BossBoss tag.
    • Bug: Enemy icons are not always displayed correctly on the Boss health bars.
  • 23 May 2023 - v1.7.3a
  • 3 May 2024 - v1.20.0
    • Boss now makes enemies immune to being confused, when the source is from a tower.
  • 10 May 2024 - v1.21.0
    • Boss now makes enemies immune to being damaged by Nuke's fallout damage.
    • Boss health bars no longer display decimal health.
  • 18 May 2024 - v1.22.0
    • Boss now makes enemies immune to being knocked back.
  • 28 August 2024 - v1.29.0
    • Bug: Boss does not make enemies immune to being slowed down by the DJ Booth.
  • 31 August 2024 - v1.29.7
    • Bugfix: Boss now makes enemies immune to being slowed down by the DJ Booth.
  • 6 November 2024 - v1.40.0
    • Boss enemies can no longer be slowed down by the Harvester's, and by extension the Farm's Thorns.
    • Boss enemies no longer can have their defense reduced.
    • Bug: Burn, freeze and Jester defense dropping can still reduce defense of Boss enemies.
  • 16 April 2025 - v1.61.0
    • Health bars now get smaller and sorted into multiple columns when there are multiple Boss enemies at once.
    • Bug: Most sounds except certain ones like music now get quieter when a Boss enemy spawns.
  • 11 June 2025 - v1.67.0
    • Boss enemies are now immune to being converted or slowed down by the Hacker.
  • 5 May 2026 - v1.90.0
    • Boss enemies are now immune to being slowed down by the Slime Trooper.


File:AttributesHeader.png
Enemy Types Hidden • Lead • Flying • Ghost • Boss
Immunities Freeze Immunity • Burn Immunity • Splash Damage Immunity • Stun Immunity • Full Immunity • Energy Immunity (Removed) • Collision Immunity (Removed) • Partial Electric Immunity (Removed)
Status Effects Scale • Bloated • Nimble • Slime • Health Regen • Tank • Aggro • Corpse • No Target • Blessed • Neuralyzed • Slowed • Shield (Removed)
Other Shield Health • Defense
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