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Blastocyst

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IsaacHDIsaac Rebirth

Blastocyst
Blastocyst full
Offical artwork by Edmund McMillen
Statistics
Type
Health
Damage
{{{type}}}
{{{health}}}
{{{damage}}}
Floor(s)
The Womb
Related Bosse(s)
Monstro
Effective Item(s)
N/A
Dropped Item(s)
Common Drops
WotL Common Drops


The Blastocyst is a rare boss composed of a large gelatinous bubble with an Embryo in its centre that will occasionally appear in the Womb/Utero. Rarely, instead of the large form, two medium and two small Blastocysts will appear. Several non-Boss variations with a shell are occasionally found in the Womb (or very rarely in the Depths), though the weakest versions (with just the non-hostile Embryo) can be found in most floors, particularly in rooms with a blood donation machine. Due to its behavior, it is essentially a weaker Monstro version encountered in The Womb.

Behavior

In its largest form, Blastocyst can do a low hop, sometimes scattering bullets all over the place. It can also do a large jump shooting in 8 directions upon landing. It will split into two smaller versions upon taking enough damage.

In its next form, Blastocyst can shoot a 4 way shot either in the four cardinal directions or diagonally when it lands after jumping. It also splits into 2 smaller forms upon taking enough damage.

In its next form, it fires a 4 way shot in the four cardinal directions after being still for a short time. It does not shoot when landing after jump. It loses its bubble upon taking enough damage and becomes an Embryo.

Trivia

  • Also known as "Blobby" or "The Embryo" according to the Unholy Edition art booklet.
  • In mammalian biology, a blastocyst is a hollow fluid-filled cellular structure formed in early pregnancy which contains the cells which will eventually form an embryo.

Gallery

Videos


Bosses
Regular Bosses
Blastocyst button

Blastocyst
Brownie
Chub button

Chub
Daddy Long Legs button

Daddy Long Legs
Dangle
Dark One button

Dark One
Dingle button

Dingle
Duke of Flies button

The Duke of Flies
Fallen button

The Fallen
Fistula button

Fistula
Gemini button

Gemini
Gurdy button

Gurdy
Gurdy Jr button

Gurdy Jr.
Gurgling button

Gurglings
Haunt button

The Haunt
Larry Jr button

Larry Jr.
Little Horn
Loki button

Loki
Mama Gurdy button

Mama Gurdy
Mask of Infamy button

Mask of Infamy
Mega Fatty button

Mega Fatty
Mega Maw button

Mega Maw
Monstro button

Monstro
Mr Fred button

Mr. Fred
Peep button

Peep
Pin button

Pin
Polycephalus button

Polycephalus
Rag Man
Scolex button

Scolex
Turdlings
Widow button

Widow
Posthumous Bosses
Adversary button

The Adversary
Blighted Ovum button

The Blighted Ovum
Bloat button

The Bloat
Cage button

The Cage
Carrion Queen button

Carrion Queen
The Forsaken
The Frail
Gate button

The Gate
Hollow button

The Hollow
Husk button

The Husk
Lokii button

Lokii
Monstro II button

Monstro II
Teratoma button

Teratoma
The Stain
Wretched button

The Wretched
Alternative Bosses
CHAD button

C.H.A.D.
Gish button

Gish
Sister Vis button

Sisters Vis
Steven button

Steven
Triachnid button

Triachnid
Harbingers
Conquest button

Conquest
Death button

Death
Famine button

Famine
Headless Horseman button

Headless Horseman
Pestilence button

Pestilence
War button

War
Final Bosses
XXX button

???
Hush
Isaac button

Isaac
It Lives button

It Lives
Lamb button

The Lamb
Mega Satan button

Mega Satan
Mom button

Mom
Mom's Heart button

Mom's Heart
Satan button

Satan
Ultra Greed
Minibosses
Seven Deadly Sins
Envy button

Envy
Gluttony button

Gluttony
Greed button

Greed
Lust button

Lust
Pride button

Pride
Sloth button

Sloth
Wrath button

Wrath
Seven Super Deadly Sins
Envy button

Super Envy
Super Gluttony button

Super Gluttony
Super Greed button

Super Greed
Super Lust button

Super Lust
Super Pride button

Super Pride
Super Sloth button

Super Sloth
Super Wrath button

Super Wrath
Ultra Pride button

Ultra Pride
Angels / Demons
Krampus button

Krampus
Angel button

Gabriel
Angel button

Uriel
Angel button

Fallen Angels
LEGENDS: The Binding of Isaac bosses are yellow. Wrath of the Lamb bosses are teal. Rebirth bosses are orange. Afterbirth bosses are crimson. Afterbirth † bosses are violet.

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