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The Boss Rush is a special event that is activated upon the use of Terminus. During the event, every vanilla and Calamity boss spawns sequentially in a predetermined order. The bosses summoned are far stronger than in their original fights and have immensely buffed HP and damage, giving them all similar difficulties despite their usual distance in the game's progression. The Boss Rush can be deactivated at any time by using Terminus again.

Defeating the Boss Rush rewards the player with the Rock.


Upon starting the Boss Rush, bosses will spawn in a predetermined order that never changes. Only one boss will spawn at a time; the next boss will spawn once the prior boss is defeated. A total of 40 bosses will spawn during the Boss Rush. The bosses are divided into five Tiers, with each new Tier signified by a status message in the chat and a brief rest period.

If a boss cannot be summoned due to an improper time, the time will be changed to accomodate the boss.

The order is as follows:

Boss Rush Progression
Tier Boss Health Notes
Tier 1
Queen Bee

3,150,000 / 4,410,000 / 5,071,500

Brain of Cthulhu

1,000,000 / 1,700,000 / 2,720,000

King Slime

3,000,000 / 4,200,000

Eye of Cthulhu

4,500,000 / 5,850,000 / 7,312,500

Sets the time to night (7:30 PM)
Skeletron Prime

1,100,000 / 1,650,000 / 1,980,000

Sets the time to night (7:30 PM)

1,300,000 / 1,950,000 / 4,425,000

Sets the time to day (4:30 AM)
Profaned Guardians

2,650,000 / 4,040,000

Sets the time to day (4:30 AM)
Eater of Worlds

2,500,000 / 3,500,000 / 4,550,000

Astrum Aureus

7,400,000 / 11,840,000

Sets the time to night (7:30 PM)
The Destroyer

2,500,000 / 3,750,000 / 4,687,500

Sets the time to night (7:30 PM)
Tier 2
The Twins

2,750,000 / 4,125,000 / 5,268,750

Sets the time to night (7:30 PM)
The Dragonfolly

3,000,000 / 4,800,000

Sets the time to day (4:30 AM)
Wall of Flesh

4,500,000 / 6,300,000 / 11,970,000

Teleports the player to the Underworld
The Hive Mind

3,350,000 / 5,360,000

Teleports the player to their spawn point

1,600,000 / 3,200,000 / 4,000,000

Sets the time to night (7:30 PM)
Storm Weaver

3,670,000 / 5,872,000

Sets the time to day (4:30 AM)
Aquatic Scourge

10,000,000 / 16,000,000

Desert Scourge

16,500,000 / 26,400,000

Lunatic Cultist

2,640,000 / 3,300,000 / 4,675,000

Tier 3

11,000,000 / 17,600,000


1,600,000 / 2,240,000 / 5,152,000

Ceaseless Void

200 / 400

The Perforators

2,700,000 / 4,320,000


3,000,000 / 4,800,000

Brimstone Elemental

6,500,000 / 10,400,000

Signus, Envoy of the Devourer

2,400,000 / 3,840,000


6,370,000 / 9,650,000

Duke Fishron

2,900,000 / 3,480,000 / 6,438,000

Tier 4
Moon Lord

3,100,000 / 4,650,000 / 7,980,000

Astrum Deus

4,900,000 / 7,840,000

Sets the time to night (7:30 PM)

3,250,000 / 5,200,000

Sets the time to day (4:30 AM)
The Plaguebringer Goliath

3,700,000 / 5,920,000


5,200,000 / 8,320,000

Sets the time to night (7:30 PM)
Leviathan and Anahita

9,600,000 / 15,360,000

Sets the time to day (4:30 AM)
The Old Duke

4,000,000 / 6,400,000

The Slime God

8,200,000 / 13,120,000

Providence, the Profaned Goddess

12,500,000 / 20,000,000

Sets the time to day (4:30 AM)
Tier 5
Supreme Calamitas

2,100,000 / 3,360,000

Jungle Dragon, Yharon

3,700,000 / 5,920,000

Sets the time to day (4:30 AM)
The Devourer of Gods

9,200,000 / 14,720,000

The Devourer of Gods will be in its final phase

Boss Rush Curses[]

There are five curses that can be enabled through the configuration options. They are disabled by default. The curses impose restrictions on the player while the Boss Rush is active. They serve no purpose other than to challenge the player and offer no additional rewards.

  • The Accessory curse disables the sixth and seventh accessory slot gained through the Demon Heart and Celestial Onion.
  • The Health curse negates all positive life regen.
  • The Dash curse disables all dashes from items such as the Cryogen lore item, Statis' Ninja Belt or Shield of Cthulhu.
  • The Xeroc curse gives all enemies a reddish tint and increases their movement speed in a similar manner as the Demonshade enrage.
  • The Immunity curse prevents the player from getting hit more than once within the span of three seconds. If the player is hit more than once within a span of three seconds, they will instantly die.


  • Many bosses in the Boss Rush will use their AI and functions normally exclusive to Expert, Revengeance, or Death Mode. This includes Supreme Calamitas having the Death Mode arena size and the Devourer of Gods' head instantly killing the player on contact.
    • However, some AI and functions still change between modes, such as whether or not Devourer of Gods’ screen shader is black the entire fight.
    • Several bosses are sped up due to the potential speed of the player.
  • Despite time being reset to the start of day/night for bosses that can only be fought at day/night, it is still possible to run out of time. In this case, the boss will despawn, time will reset back to day/night and boss will be resummoned with full health.
  • All damage taken is increased (where applicable) to a minimum value that increases as the player progresses through the event:
    • Contact damage has a minimum of 240 / 400 which increases by 2 for each boss.
    • Projectile damage has a minimum of 220 / 360 which increases by 1 / 2 for each boss.
  • King Slime can spawn Rainbow Slimes and Umbrella Slimes when damaged, even without raining.
  • The Eater of Worlds will be immune to all debuffs except Enraged, Kami Flu, and Shellfish Claps, and take 99.9% less damage for ten seconds after being summoned.
  • The Profaned Guardians and Providence do not become invulnerable outside their respective biomes.
  • Providence performs both the Crystal and the Holy Ray attacks regardless of the biome she was spawned in.
  • Yharon does not spawn the flare bomb ring when defeated.
  • Bosses slain during Boss Rush do not drop any items or currency.
  • Providence and the Wall of Flesh do not create Profaned Rock and Demonite/Crimtane brick squares when defeated.
  • The waiting time between the prior boss's death and the next boss spawning is 1 second during Tiers 1 through 3, which is increased to 6 seconds during Tiers 4 and 5.
  • All wire-activated mechanisms are disabled during a Boss Rush.
  • Unlike the other bosses, the difficulty of Supreme Calamitas' battle is made easier in the Boss Rush compared to her usual fight.
  • The health of the bosses during the event only scales up with 2 people in multiplayer.
  • Defeating a boss that wasn't defeated prior to the Boss Rush will not bring that boss' aftermath and will not count that boss as being defeated outside of Boss Rush.


  • Many health and buff potions, as well as mana for mages should be brought, as the Boss Rush can easily take over twenty minutes.
  • Auric Tesla armor is a good choice as it provides a wide array of set bonuses and two methods of Death Prevention.
  • Despite being able to begin the Boss Rush at almost any point in the game, the player should definitely have end-game weapons and equipment before facing it if they hope to succeed.
  • Contact damage with any of the bosses and their projectiles/minions should be avoided as they can easily deal over 200 damage even with endgame armor.
  • Players should attempt to distance themselves from any floors or other solid tiles after defeating Providence, in order to maximize the amount of space available to them once Supreme Calamitas spawns and her arena generates.
  • Avoid the Devourer of Gods' head at all costs, as contact with it will instantly kill the player.
    • If the player killed Yharon midair, they must find a surface to stand on as the Devourer of Gods will otherwise charge towards them instantly killing them. Having an arena can solve this problem.


  • The boss progression was based on a series of polls that took place in the Calamity Mod Discord server, gauging players' favorite bosses and the ones they found the most difficult, with the resulting total being used to determine the rush's order.
  • The Boss Rush Curses were inspired by the Pantheon Bindings from the game Hollow Knight. These Bindings, activated during the boss rush mode in said game, hindered the player character in various ways.


  • "Hmm? Ah, another contender. Very well, may the ritual commence!" (when started)
  • "Hmm? Oh, you're still alive. Unexpected and exhilarating, but don't get complacent just yet." (before entering Tier 2)
  • "Hmm? Persistent aren't you? Perhaps you have some hope of prosperity, unlike past challengers." (before entering Tier 3)
  • "Hmm? Your perseverance is truly a trait to behold. You've come further than even the demigods in a short time." (before entering Tier 4)
  • "May your skills remain sharp for the last challenges." (upon entering Tier 4)
  • "Hmm? So you've made it to the final tier, a remarkable feat enviable by even the mightiest of the gods." (before entering Tier 5)
  • "Go forth and conquer 'til the ritual's end!" (upon entering Tier 5)
  • "Hmm? You expected a reward beyond this mere pebble? Patience, the true reward will come apparent in time..." (after completing the Boss Rush)