Boss Health Bar

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This article is about the Calamity Mod's boss health bar, for the vanilla one, see Boss health bar.
Boss Health Bar
  • Boss Health Bar.png
    An example of a boss health bar mid-fight.

The Calamity Mod adds a boss health bar to the player's interface that can be toggled via Settings menu and can be configured further in Configuration options. When enabled, this will replace the vanilla default boss health bar.


  • Appears in the lower right corner of the screen when either a boss or mini boss is summoned.
    • Bosses with multiple parts (e.g. Moon Lord) are factored in and have their own separate bars.
    • Also appears when certain rare vanilla enemies (e.g. Biome Mimics) appear.
    • The boss health bar does not show for Abyss mini bosses.
  • Has a health percentage gauge, a yellow health bar, and a decorative blue bar separating them.
    • The health bar turns red as the enemy takes damage, with the red disappearing if the enemy hasn't taken damage for 0.5 seconds. This is to indicate recent "combo" damage.
  • Small extra information text to the lower right of the bar displays the enemy's total and current health.
    • Bosses with a high number of parts, such as Eater of Worlds' segments, have their remaining number of parts displayed with the small text instead of health.
    • Extra text can also be toggled via Configuration options.
  • When opening the inventory or during Events and invasions, the bar adjusts to the left to make room for the armor and accessories tab or event progress meter.
  • When a boss is enraged, the health bar and the name of the boss will glow red.
  • When a boss is under the effect of a defensive boost, the health bar will glow grey.


  • The boss health bar also works with bosses from other Terraria mods, though it may not work as intended.
  • The boss health bar will not appear with any NPC with 800 life or less.


  • The design is based on the health bars from Metal Gear Rising: Revengeance.
  • The boss health bar was co-coded by mod creator Fabsol/MountainDrew and programmer Boffin.
  • The Devourer of Gods' final form's health was intentionally displayed as 600% in previous versions of the mod, alluding to its increased armor and health.


These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
  • Now toggleable in the "Interface" section of the Settings menu through the "Boss Bar Style" option.
  • Now glows gray if bosses are affected by a temporary defense or damage reduction increase.
  • Now glows red while a boss is enraged.
  • Increased the maximum health needed for an enemy to appear from 400 to 800, and Cnidrion can no longer appear on it.
  • No longer appears for any NPCs with under 400 health.
  • Fixed an issue on platforms such as Linux.
    • Now accounts for Old One's Army event progress bar.
    • Now counts Moon Lord's individual parts.