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Delirium (デリリウム Deririumu) 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
Delirium-Adversary
The Adversary
Coming soon.
Delirium-Big-Horn
Big Horn
Coming soon.
Delirium-Blastocyst
Blastocyst
Coming soon.
Delirium-Blighted-Ovum
The Blighted Ovum
Contusion: Follow, leaving red creep
Suture: Brimstone-beam
Delirium-Bloat
The Bloat
Coming soon.
Delirium-Brownie
Brownie
Spawn Corn Mines
Hopping
Delirium-Cage
The Cage
Coming soon.
Delirium-Carrion-Queen
Carrion Queen
Coming soon.
Delirium-CHAD
C.H.A.D.
Coming soon.
Delirium-Chub
Chub
Coming soon.
Delirium-Conquest
Conquest
Coming soon.
Delirium-Daddy-Long-Legs
Daddy Long Legs
Coming soon.
Delirium-Dangle
Dangle
Coming soon.
Delirium-Dark-One
Dark One
Dash
Ring of bullets
Delirium-Death
Death
Coming soon.
Delirium-Dingle
Dingle
Coming soon.
Delirium-Duke-of-Flies
The Duke of Flies
Spawn Attack Flies
Delirium-Fallen
The Fallen
Coming soon.
Delirium-Famine
Famine
Coming soon.
Delirium-Fistula
Fistula
Coming soon.
Delirium-Forsaken
The Forsaken
Coming soon.
Delirium-Frail
The Frail
Coming soon.
Delirium-Gabriel
Gabriel
4-way light beams
Delirium-Gate
The Gate
Coming soon.
Delirium-Gemini
Gemini
Contusion: Follow
Suture: Blood-shot
Delirium-Gish
Gish
Explosive shot
Delirium-Gurdy
Gurdy
Coming soon.
Delirium-Gurdy-Jr
Gurdy Jr.
Dash
Delirium-Gurgling
Gurgling
Dash
Delirium-Haunt
The Haunt
Coming soon.
Delirium-Headless-Horseman
Headless Horseman
Coming soon.
Delirium-Hollow
The Hollow
Coming soon.
Delirium-Hush-1
Hush (1st Phase only)
Coming soon.
Delirium-Husk
The Husk
Coming soon.
Delirium-Isaac
Isaac
Coming soon.
Delirium-It-Lives
It Lives
Wave of blood-shots.
Delirium-Krampus
Krampus
Coming soon.
Delirium-Lamb
The Lamb
Coming soon.
Delirium-Larry-Jr
Larry Jr.
Move around aimlessly
Contact damage
Delirium-Little-Horn
Little Horn
Coming soon.
Lil' Haunt Following in quick speed
Delirium-Loki
Loki
Coming soon.
Delirium-Lokii
Lokii
Coming soon.
Delirium-Mama-Gurdy
Mama Gurdy
Coming soon.
Delirium-Mask-of-Infamy
Mask of Infamy
Coming soon.
Delirium-Matriarch
The Matriarch
Coming soon.
Delirium-Mega-Fatty
Mega Fatty
Coming soon.
Delirium-Mega-Maw
Mega Maw
Coming soon.
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-Mr-Fred
Mr. Fred
Coming soon.
Delirium-Peep
Peep
Coming soon.
Delirium-Pestilence
Pestilence
Coming soon.
Delirium-Pin
Pin
Coming soon.
Delirium-Polycephalus
Polycephalus
Coming soon.
Delirium-Rag-Man
Rag Man
Coming soon.
Delirium-Rag-Mega
Rag Mega
Coming soon.
Delirium-Scolex
Scolex
Coming soon.
Delirium-Sisters-Vis
Sisters Vis
Coming soon.
Delirium-Stain
The Stain
Coming soon.
Delirium-Steven
Steven
Big: Follow
Small: Enraged quickly
Delirium-Teratoma
Teratoma
Coming soon.
Delirium-Triachnid
Triachnid
Coming soon.
Delirium-Turdling
Turdling
Coming soon.
Delirium-Uriel
Uriel
Coming soon.
Delirium-War
War
Coming soon.
Delirium-Widow
Widow
Coming soon.
Delirium-Wretched
The Wretched
Coming soon.

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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