Boss Rush

"We expect you to turn in a perfect performance!"

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.

Progression
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 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.

Tips

 * 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.

Trivia

 * 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.

Messages

 * "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)