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Delirium

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Delirium is the final boss at the end of The Void chapter. It is added to the Afterbirth † DLC. It is assumed to be one of the true final bosses appearing in final chapters of the game, along with Mega Satan.

Description Description

Delirium's true self is a gigantic, white skull-resembled entity sporting large eye-sockets consisted with black eyes and yellow iris. Its mouth sport long vein-like "stitches", similar to Hush.

From all forms Delirium takes, each are identical to respective bosses from the previous chapters, except with Delirium's own colors, including white colors, yellow eyes, and a "melting" mouth.

Blast Behavior

Delirium can teleport randomly around the room, and send out wave of white projectiles.

Unlike other bosses, Delirium has a unique ability to shape-shift into all bosses from previous chapters, including both normal, posthumous and alternative types, as well as final bosses. However, Delirium does not shape-shift into forms based on minibosses (such as Seven Deadly Sins, Krampus, etc.), although it still can take forms based on the angels. Delirium can also transform into Lil' Haunt, the only monster it can turn into that is not a boss. All various forms Delirium shifts into are listed in the table -

Form Description
Delirium-Blue-Baby
Blue Baby
Wave of tears
Holy beams
Big Horn Coming soon.
Delirium-Blastocyst
Blastocyst
Coming soon.
Delirium-Blighted-Ovum
The Blighted Ovum
Contusion: Follow, leaving red creep
Suture: Brimstone-beam
Brownie Spawn Corn Mines
Hopping
Delirium-Dark-One
Dark One
Dash
Ring of bullets
Delirium-Duke-of-Flies
The Duke of Flies
Spawn Attack Flies
Gabriel 4-way light beams
Delirium-Gemini
Gemini
Contusion: Follow
Suture: Blood-shot
Delirium-Gish
Gish
Explosive shot
Delirium-Gurdy-Jr
Gurdy Jr.
Dash
Delirium-It-Lives
It Lives
Wave of blood-shots.
Delirium-Lamb
The Lamb
Coming soon.
Delirium-Larry-Jr
Larry Jr.
Move around aimlessly
Contact damage
Lil' Haunt Following in quick speed
Delirium-Mega-Satan
Mega Satan
Wave of blood-shots
Earthquakes
Delirium-Mom
Mom
Stomp constantly
Delirium-Moms-Heart
Mom's Heart
Wave of blood-shots.
Delirium-Monstro
Monstro
Leaping
Spew amount of blood-shots
Delirium-Monstro-II
Monstro II
Brimstone-beam
Delirium-Steven
Steven
Big: Follow
Small: Enraged quickly

Note Notes

  • If Delirium is killed in its Brownie form, it will spawn many Dank Squirts.

Question Trivia

  • So far, this is the only boss to have the most amount of health than any other previous bosses.
  • Delirium's boss transformations are chosen by previous bosses the character have fought in the run. This can be proven by running a mod, going into the console, beating 1 or 2 bosses, then summoning Delirium.
  • Delirium-Hush-2

    Unused form for Delirium, based on Hush's second form.

    Delirium has an unused form of Hush's second form, which can be found within the game's files.
  • Delirium's true appearance could slightly resemble Hush's unused skinless form.
  • The word "delirium" is a serious disturbance in mental abilities that results in confused thinking and reduced awareness of the person's environment.
    • Delirium's name may actually suggest by its shape-shifting ability.


Bosses
Bosses
Regular Bosses
BlastocystChubDaddy Long LegsDark OneDingleDuke of FliesThe FallenFistulaGeminiGurdyGurdy Jr.GurglingsThe HauntLarry Jr.LokiMama GurdyMask of InfamyMega FattyMega MawMonstroMr. FredPeepPinPolycephalusScolexTurdlingsWidow

Afterbirth: BrownieDangleLittle HornRag ManTurdlings
Afterbirth †: Big HornRag Mega
Antibirth-only: Baby PlumBeelzeblubChimeraGreat GideonHornfelThe RainmakerReap CreepRotgutThe ScourgeThe SirenTuff TwinsWormwood

Posthumous Bosses
The AdversaryThe Blighted OvumThe BloatThe CageCarrion QueenThe GateThe HollowThe HuskLokiiMonstro IITeratomaThe Wretched

Afterbirth: The ForsakenThe FrailThe Stain
Antibirth-only: The HereticThe PileThe Visage

Alternative Bosses
C.H.A.D.GishStevenTriachnid

Afterbirth †: Sisters Vis

Harbingers
ConquestWarFamineDeathPestilenceHeadless Horseman
Final Bosses
???IsaacIt LivesThe LambMega SatanMomMom's HeartSatan

Afterbirth: HushUltra Greed
Afterbirth †: Delirium
Antibirth-only: The Witness

Mini-bosses
Seven Deadly Sins
EnvyGluttonyGreedLustPrideSlothWrath
Seven Super Deadly Sins
Super EnvySuper GluttonySuper GreedSuper LustSuper PrideSuper SlothSuper WrathUltra Pride
Angels / Demons
KrampusGabrielUrielFallen Angels

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