Delirium

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Boss Delirium name.png
Boss versus screen image
 
 
Table dividing line 1.png
 
In-game appearance
Table dividing line 2.png
 
Boss
Stage The Void icon.png
Table dividing line 3.png
 
Final Boss Chest
Added in Afterbirth †

Delirium is a boss added in The Binding of Isaac: Afterbirth †. It is the main boss of The Void The Void, and the final boss of the Final Ending and the series as a whole.

Behavior

  • Delirium will teleport around the room, sending out an array of White projectiles and Green projectiles that explode like Ipecac Ipecac.
  • Its most notable (and dangerous) attack is that it will transform into bosses previously encountered during the run, including a few of the "final" bosses (Mom, It Lives, etc.).
    • While transformed, it will attack with its White and Green projectiles along with the attacks of the boss it transformed into.
    • When it transforms into a boss, Delirium retains its own health, not the health of the boss it transformed into.
    • The attacks of the transformed boss are dependent on Delirium's current HP. For example, if Delirium transforms into War while at <50% HP, it will be horseless and run at Isaac.
    • It can rarely transform into two instances of the same boss.
    • Whether it turns into Champion variants or regular variants is random and does not depend on which variant was previously defeated. For instance, it can turn into Dark Greyish Green Champion Gurdy, even if the regular Gurdy was the defeated variant, and vice-versa.
    • It is unable to properly transform into Hush.
  • Occasionally, it will return to its main form to shoot the White projectiles more aggressively and to shoot the Green projectiles more often.
  • Progressively, it will alternate through each form faster and become more aggressive.

Upon defeat, the screen will start to glitch and fill with static while short moments from the current run are played, and the room will switch between different environments, ending with a Chest layout. After being defeated, Delirium will burst into blood and drop a Final Boss Chest, playing the final ending.

Notes

  • Delirium is immune to Chaos Card Chaos Card.
  • Plan C Plan C is ineffective against Delirium. Because his death animation is longer than 3 seconds, Isaac will still be killed first.
  • Most entities that are considered to be bosses by the game (usually identified by ones that add the boss health bar to the screen) are marked as bosses that Delirium can transform into.
    • The Seven Sins are exceptions to this.
    • Delirium can transform into either form of Satan.
    • When transformed into the Gurglings or the Turdlings, it will only appear as one instead of two.
    • When transformed into The Headless Horseman, it transforms into either the head or the body, but it doesn't transform into both.
    • Each size of Fistula and Teratoma count as their separate boss which Delirium can transform into just like any other boss.
    • This also results in many bugs due to unaccounted for transformations. These can be viewed in the bugs section of this page.
    • When transformed into a boss that has multiple segments, the extra segments can be killed. The head, however, cannot.
    • This also applies to Gemini - Suture can be killed but Contusion cannot.
    • All parts of Fistula and Teratoma can be killed (though they have much greater health than normal), and the room will remain empty until Delirium transforms again. Even though the segments have been killed, Delirium itself has not been killed.
  • When transformed into two instances of the same boss (like Lokii or Sisters Vis), one of them can be killed but the other cannot.
  • Delirium's Mom form only stomps and does not spawn enemies.
  • If Delirium transforms into Gemini then undergoes another transformation, Suture doesn't disappear. Instead, he will come after the player like the original version does after Contusion is killed.
  • If Delirium transforms into The Lamb's second phase then undergoes another transformation, the body doesn't disappear and can be killed, just like the original Lamb's body.
    • However, Delirium can also transform into the Lamb's body on its own. If this happens, the body will disappear when Delirium transforms again.

Gallery

Unlockable Achievements

Trivia

  • Delirium is the only enemy immune to Chaos Card.
  • Killing Delirium in a daily challenge counts as winning it. However, this does not reward any unique bonus points.
  • Unlike other completion marks, defeating Delirium does not add a mark to the post-it note. Instead, the note will become tattered (with blood on Hard mode).
  • If no other bosses have been encountered during the run, Delirium will be unable to transform.
    • This is normally impossible as you have to defeat at least one boss, even if extremely lucky. Use floor skips such as Ehwaz or We Need to Go Deeper! until chapter 3. After the fight with Mom, Isaac has a 5% chance of teleporting to The Void, but only if Isaac has 10+ tear damage or 20+ items. Then, you must find Delirium without encountering any other bosses.
  • There was a glitch in the original version of The Binding of Isaac: Afterbirth † which caused Delirium's main form to lack an idle animation. This was soon patched.
  • In the game files, there is an unused Delirium transformation of Ultra Greed with a beard.
    • Delirium can transform into Ultra Greed if he is encountered, but this is normally impossible as the bosses never appear in the same game mode.
  • Delirium is Isaac's manifestation of the "white light at the end of the tunnel" where the entire history of his life flashes before his eyes, moments before Isaac's death.[1]
    • This might be reflected by Delirium's death animation and its ability to shapeshift into different bosses you previously encounter.
  • Every time Delirium transforms into another boss, it adds onto the encounters counter in the Bestiary.
  • If Delirium transforms into a Champion boss that doubles itself (i.e. Red Champion Monstro), one of them will have Delirium's skin while the other will have the original boss' skin.
    • In this case, the one with the original boss' skin can be killed, but the one with Delirium's skin cannot.
  • If Delirium transforms into Mom as soon as the battle starts, it will stomp in the center of the room regardless of Isaac's position, similar to how the original Mom always starts her battle by stomping in the center of the room.
    • Similarly, If Delirium transforms into Mom's Heart/It Lives as soon as the battle starts, it will be accompanied by two Eyes in the same position as they are when they accompany the original Mom's Heart/It Lives at the start of its battle.
  • Prior to Booster Pack #5, Delirium could turn into a Lil' Haunt.
    • Also, if it transformed into Black Champion Brownie when at low health, It would spawn two Dank Squirts like the original boss would and die before the health bar actually fully depleted, without playing its death animation. This no longer happens because Delirium's Brownie form (normal and Black Champion) no longer transitions into the second phase (turning into a weakened Dangle or leaving two Dank Squirts, respectively).
  • Delirium uses the exact same sprite for both its Dingle and Dangle forms.
  • If Delirium transforms into Mega Fatty and performs the vomit attack, it will attract its White and Green projectiles towards it.

Bugs

Bug Bug! If Delirium transforms into an enemy like Chub with multiple hitboxes, the game may crash if one of the secondary hitboxes is hit by Chaos Card.
Bug Bug! Delirium can transform into Hush if very few bosses have been encountered during that run, but the sprites are unfinished and many of the attacks do not work properly.
Bug Bug! Delirium can transform into Fallen Uriel and Fallen Gabriel, but they do not have unique Delirium skins.
Bug Bug! If Delirium transforms into Mega Satan, the sprites will bug out. It can attack normally, but the sprite may not be visible/half-visible/only showing the hands.
Bug Bug! On Isaac's last will, Delirium will be shown in its current form rather than its main one. Sometimes it will show his main form, even if Isaac is killed by a different form.
Bug Bug! Delirium can sometimes deal unavoidably glitched damage. For example, when transformed into Mom, Isaac can sometimes take damage before Mom's leg stomps.
Bug Bug! Sometimes, when Delirium transforms into a segmented boss, its health will appear to be lower than it is. This is usually purely visual and returns to normal whenever it transforms again, though it may not return to normal.[2]

References


Bosses Boss Monstro.png
Chapter 1
Stage The Basement icon.pngStage The Cellar icon.pngStage Burning Basement icon.png
GeminiStevenBlighted OvumDingleThe Duke of FliesFamineFistulaGurglingsThe HauntLarry Jr.MonstroPinWidowThe FallenThe Headless Horseman
DangleLittle HornRag ManTurdlings
Chapter 2
Stage The Caves icon.pngStage The Catacombs icon.pngStage Flooded Caves icon.png
ChubC.H.A.D.Carrion QueenDark OneGurdyGurdy Jr.The HollowThe HuskMega FattyMega MawPeepPestilencePolycephalusThe WretchedThe FallenThe Headless Horseman
The ForsakenThe FrailThe Stain
Big HornRag Mega
Chapter 3
Stage The Depths icon.pngStage Necropolis icon.pngStage Dank Depths icon.png
The AdversaryThe BloatThe CageThe GateMonstro IIGishLokiMask of InfamyWarThe FallenThe Headless HorsemanMom
Brownie
Sisters Vis
Chapter 4
Stage The Womb icon.pngStage Utero icon.pngStage Scarred Womb icon.png
BlastocystThe BloatConquestDaddy Long LegsTriachnidDeathLokiiMama GurdyMr. FredScolexTeratomaThe FallenThe Headless HorsemanMom's HeartIt Lives
Sisters VisThe Matriarch
Blue Womb
???
Hush
Chapter 5
Stage Sheol icon.pngStage Cathedral icon.png
SatanIsaac
Chapter 6
Stage Dark Room icon.pngStage The Chest icon.png
???The LambMega Satan
The Void
Stage The Void icon.png
Delirium
Greed Mode
Ultra Greed
Ultra Greed
Ultra Greedier
The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth
Achievements Achievements Attributes Attributes Bosses Bosses TarotCard.png Cards and Runes Challenges Challenges Chapters Chapters
Characters Characters MainPageBabies.png Co-op Items Items Item pools Item pools Monsters Monsters Objects Objects
Pickups Pickups Pills Pills Rooms Rooms Seeds Seeds Transformations Transformations Trinkets Trinkets