-121061695This article refers to both the original game and the remake.-119875774
IsaacHDIsaac Rebirth

Loki (ロキ Roki), also known as "Baby Demon" and "Fetus Demon" in the artbook, is a boss found in the Depths.


He resembles a red demon Baby with four arms, small horns, and The Mark on his forehead. He also has a smile with large fangs.


His main attack has three steps. He makes poses whilst attacking. First, he shoots 4 projectiles in a plus shaped pattern, followed by 4 shots in an X shaped pattern, and finishing with another 4 shots in a plus-shape pattern. His other attack shoots 8 projectiles in a circle around him.

He also randomly teleport himself during the fight.

He is sometimes assisted by a single Poky. At times, he may summon Boom Flies to accompany him, which can damage him upon exploding.

Champion Variant


Eternal Loki

Eternal Loki uses all his bullet-related attacks 3 times in a rapid session, while summoning normal Babies and Angelic Babies (though they look like their Eternal variants). He also can heal himself for 10% of his max HP every time Isaac takes damage.


  • It is rare to find him as a boss. He is, however, very common in Sheol (encountered in pairs) and sometimes can be encountered in The Womb. He can be encountered in triplicate in The Chest.


Page 25

Loki in the Artbook.

  • During developement, Loki's codename was "Mr.Cool".[1]
  • It was confirmed by Edmund on Formspring that Loki indeed possesses two pairs of arms.
  • In Norse mythology, Loki is the god of mischief and chaos.
  • His Japanese name, "Roki", translates to "deadlines".


TBoI information

The Binding of Isaac

Loki is a boss encountered in The Depths and Necropolis.



Loki as seen from Isaac's Last Will.

From this version, Loki's Boom Flies does get damaged by Pokies.


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

Afterbirth †: Sisters Vis

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

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

Seven Deadly Sins
Seven Super Deadly Sins
Super EnvySuper GluttonySuper GreedSuper LustSuper PrideSuper SlothSuper WrathUltra Pride
Angels / Demons
KrampusGabrielUrielFallen Angels
Community content is available under CC-BY-SA unless otherwise noted.