The Sepulcher doesn't deal contact damage but instead shoots bursts of Brimstone Darts in diagonal directions from its body segments (in descending order from last to first segment). When the last of these hearts are destroyed, the Sepulcher will fade out and die.

Ten immobile Brimstone Hearts will spawn along with it, positioned in the upper corners of the arena. The sequence of the Hellblasts' direction will always be the same during the Bullet Hell.ДЄfter the Bullet Hell ends, she will teleport to the upper-right corner of the arena and summon the Sepulcher to assist her before becoming mobile. She will be invincible and immobile until the Bullet Hell ends. Upon spawning, she will summon a randomized 'Bullet Hell' of vertical and horizontal Brimstone Hellblasts which travel from one edge of the player's screen to the other.Supreme Calamitas will perform these attacks once, triggered by her reaching certain amounts of health. Whilst it is not necessary to do so, it proves beneficial when playing in harder difficulties and/or with special constraints, like the Iron Heart, Defiled Feather or Armageddon. Since it is a relatively long cycle with multiple occurences of every type of attack, it is time consuming to fully memorize and comprehend it. Note that every time she shoots bursts of Brimstone Darts, some bursts are replaced by Brimstone Fire- and Gigablasts. Charges 2 times (once in the second phase).Charges 4 times (2 times in the second phase).Shoots a horizontal barrage of Brimstone Hellblasts.The attack cycle (starting as soon as the first Sepulcher is summoned): Neither going through bullet-hell phases, nor switching to her second phase changes the current position in this cycle. Supreme Calamitas has a constant attack cycle which only interrupts when she is not attacking at all. Once she enters her second phase at 40% HP, the delays between her attacks as well as inside her attacks become shorter she charges more aggressively and only half as often per attack. This can cause bullets to fly in non-horizontal directions. She shoots the Hellblasts horizontally once she has taken her position to the left/right of the player - however, she can already start shooting while in the process of homing towards this position. She remains at the player's side and fires a barrage of Brimstone Hellblasts, which accelerate towards the player.She remains at the player's side and launches either 2 or 4 Brimstone Gigablasts (depending on the position in the cycle) with a constant delay between them.This is the only occurence of randomness in her attack pattern. Some of the bursts are randomly replaced with firing a Brimstone Fireblast or a Brimstone Gigablast, which both home in on the player and explode into rings of Brimstone Darts after some time, or upon contact with blocks.She performs either 3 or 4 bursts during an attack. She attempts to hover above the player, shooting bursts of 8 Brimstone Darts at the player, leaving similar-sized gaps between the projectiles.Once she enters her second phase, she will charge half as many times in a row.At the start of the attack prior to charging, she will become fully translucent.This occurs either 2 or 4 times in a row, depending on the position in the cycle. She charges at the player at an incredibly high speed, dealing massive damage.While Supreme Calamitas is mobile, she will switch between these attacks in a well defined cycle. She always remains either directly above or to the side of the player, only breaking position during Bullet Hell phases or during her devastating dash attacks. Supreme Calamitas has several powerful attacks that she will switch between in a consistent cycle. Leaving it will cause Supreme Calamitas to enrage, significantly increasing the velocity of all of her attacks and giving her 99% irreducible damage reduction. Upon spawning, Supreme Calamitas will create a 159x159 (inner available area is 157x157) square arena made of mostly unbreakable Arena Blocks. The Eye of Extinction is reusable, so Supreme Calamitas may be summoned any number of times. Supreme Calamitas does not spawn on her own and requires the player to summon her with the Altar of the Accursed, which uses Ashes of Calamity or the Eye of Extinction upon using said items at the Altar, the screen will darken, shake, and become tinted red before Supreme Calamitas herself appears above the Altar.

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