"Boss Bar" redirects here. For boss health, see Bosses.
The Eye of Cthulhu's health bar without numeric health display.
When a player is within the range of a boss or mini-boss, a red health bar will appear on the bottom of the player's screen / below the minimap that represents the boss's total remaining health. When there are multiple bosses in the player's range, only the most recent boss that had been afflicted with damage or the closest one in proximity to the player will be shown.[1]
The boss health bar also has a togglable option that enables a numeric display for boss health called "Boss Health Bar Numbers" in the settings. The maximum and remaining health of the boss will be shown on the bar when the option is on.
All four Celestial Pillars have two bars, a blue-colored one for their shield and one for their actual health. The shield bar will overlay the health bar and shows the remaining enemy kills needed to destroy the shield on the bar if the numeric display is on.
The Moon Lord's health bar shows the total health of all of his damageable parts, including all three eyes and his core.
The boss health bar will display on the bottom of the screen if the player is using a controller or keyboard and mouse.
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The boss health bar on the Mobile version. Note how it changes positions when swapping to touch controls.
Trivia
The icon on the left of the boss health bar is the map icon for that boss.
↑Information taken from the Desktop1.4.4.6 source code, method TryFindingNPCToTrack() in Terraria.GameContent.UI.BigProgressBar.BigProgressBarSystem.cs. There may be inaccuracies, as the current Desktop version is 1.4.4.9.
