The Siren

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The   Siren
Boss versus screen image
Base HPStage HP
666
0
Table dividing line 1.png
Ingame Appearance
In-game appearance

Entity ID
904.0
Table dividing line 2.png
Found In
Boss
Stage Mausoleum icon.png
Table dividing line 3.png
Dropped Items
Boss Boss
Added in Repentance
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The Siren is one of the bosses that appears in the Mausoleum Mausoleum.

Behavior[edit | edit source]

  • If Isaac has any Familiars, the Siren will sing, charming the familiars to assist her and turning their effects against Isaac.
    • If the Familiars take enough damage, they will be returned to Isaac.
  • If she has less than 3 charmed follower/orbital Familiars from Isaac, she summons up to 3 Familiars of her own. These Familiars behave similarly to Brother Bobby and can also be killed.
  • Once she has a total of 3 follower/orbital Familiars, she glides around the room for a few seconds, letting them use their effects against Isaac. After this, she swipes at Isaac, launching all remaining familiars in a cluster in his direction.
    • If the cluster collides with a wall it kills all the Familiars and releases a burst of radial projectiles and a cluster of disorganized projectiles
      • The amount of projectiles launched during this attack depends on the number of familiars that collide with the wall.
  • Sinks into the floor and chases Isaac, leaving a trail of slowing Black Creep. After reappearing, she swipes at Isaac, shooting a spread of 5 projectiles.
  • Screams, emitting a consistent shockwave around her and spawning 9 pulsating rings of tears that expand slowly outwards. These tears split into two when far enough.
    • The shockwave pushes Isaac back like an inverted Gaping Maw.
    • The rings of tears have openings towards Isaac's general direction that disappear as the tears split.

Notes[edit | edit source]

  • Bombing the skull that the Siren leaves behind unlocks the Forgotten Lullaby.
    • Bombing the skull in subsequent runs will have no effect or spawn a normal Host.
  • Charmed familiars with a charged attack (eg: Lil Brimstone) hold their charge until the Siren launches the familiars.
  • If the Siren has charmed the 1up! or Dead Cat familiars and dies, she will use one of their extra lives to revive herself at respectively full health or 10% of her health.

Unlockable Achievements[edit | edit source]

Trivia[edit | edit source]

  • In Greek mythology, Sirens were dangerous creatures, who lured nearby sailors with their enchanting music and singing voices.
  • The Siren's ring of tears and sinking in the ground attacks may be a reference to the Gorgun boss from the game Enter the Gungeon. Moreover, both bosses leave behind a "corpse" that can be destroyed.


Bosses Boss Monstro.png
Chapter 1
Stage The Basement icon.pngStage The Cellar icon.pngStage Burning Basement icon.png
GeminiStevenBlighted OvumDingleThe Duke of FliesFamineGurglingsThe HauntLarry Jr.MonstroPinWidowThe FallenThe Headless Horseman
DangleLittle HornRag ManTurdlings
Baby Plum
Chapter 1.5
Stage Downpour icon.pngStage Dross icon.png
Lil BlubWormwoodThe RainmakerMin-MinClogColostomiaTurdlet
Chapter 2
Stage The Caves icon.pngStage The Catacombs icon.pngStage Flooded Caves icon.png
FistulaChubC.H.A.D.Carrion QueenDark OneGurdyGurdy Jr.The HollowThe HuskMega FattyMega MawPeepPestilencePolycephalusThe WretchedThe FallenThe Headless Horseman
The ForsakenThe FrailThe Stain
Big HornRag Mega
Bumbino
Chapter 2.5
Stage Mines icon.pngStage Ashpit icon.png
Reap CreepTuff TwinsHornfelGreat GideonSingeThe ShellThe Pile
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
Reap CreepThe Pile
Chapter 3.5
Stage Mausoleum icon.pngStage Gehenna icon.png
The SirenThe HereticThe VisageThe Horny BoysMomMom's Heart
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
???
???
Hush
Corpse
Stage Corpse icon.png
ChimeraThe ScourgeRotgutMother
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
Home
Stage Home icon.png
DogmaThe BeastUltra DeathUltra FamineUltra PestilenceUltra War
Greed Mode
Ultra Greed
Ultra Greed
Ultra Greedier
The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth
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Characters Characters MainPageBabies.png Co-op Items Items Item pools Item pools Monsters Monsters Objects Objects
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