Hornfel

Hornfel is a boss added in The Binding of Isaac: Repentance that can appear in Mines.

Behavior[]

Phase 1[]

He appears with his own specially designed boss room, where the walls are covered in boss doors, with minecart tracks connecting them. Hornfel rides a minecart along these tracks and performs the following attacks upon entering the room:

Occasionally, when Hornfel enters the room through a door, he is accompanied by 2 Fly Bombs.
Throws 1-2 Bombs at Isaac. Additionally, each bomb has a small chance of having the Hot Bombs or Sad Bombs effect.
Throws 3 Brimstone Bombs that resemble mines. Each has a delay and detonates after a few moments.
Accelerates along one set of tracks, while frequently throwing out bombs for the duration. Slows down after multiple cycles, before getting sick and vomiting a fireball that release fire trails in the cardinal directions upon landing.
Sends out 1-2 decoy dummies with 4 HP on other tracks that burst into 6 Troll Bombs if killed or walked into.
Other minecarts occasionally appear on other tracks independent of Hornfel, carrying fire, TNT, or a variety of other enemies:
- Bony
- Faceless
- Danny
- Gurgle
- Quakey

Hornfel and his decoys deal a whole heart of contact damage.

Phase 2[]

Once Hornfel has taken enough damage, he falls out of his minecart and attempts to escape from the room via one of the doors surrounding the arena. He makes no attempt to attack Isaac but he can still deal contact damage (Though this is reduced to half a heart from a whole heart).

Other minecarts carrying other monsters and objects can still appear as usual during this phase.
If Hornfel escapes successfully, the fight ends as normal.
If Hornfel is defeated, he drops either 3 Bomb pickups, Boom!, Brimstone Bombs or Remote Detonator and unlocks Brimstone Bombs, if not already unlocked.

Gallery[]

Hornfel in-game.
Hornfel after losing his cart.
Hornfel fleeing.
Hornfel's decoy dummy.

Unlockable Achievements[]

Brimstone Bombs - After breaking Hornfel's minecart, kill him before he can escape.

Trivia[]

Hornfels is the group name for a set of contact metamorphic rocks. They are known to be very hard and durable.
The Horny Boys are a stitched amalgamation of Hornfel and Loki.

Bugs[]

Bug!	If Hornfel is killed off screen the game crashes.

Bosses
Chapter 1	Gemini • Steven • Blighted Ovum • Dingle • The Duke of Flies • Famine • Gurglings • The Haunt • Larry Jr. • Monstro • Pin • Widow • The Fallen • The Headless Horseman Dangle • Little Horn • Rag Man • Turdlings Baby Plum
Chapter 1.5	Lil Blub • Wormwood • The Rainmaker • Min-Min • Clog • Colostomia • Turdlet
Chapter 2	Fistula • Chub • C.H.A.D. • Carrion Queen • Dark One • Gurdy • Gurdy Jr. • The Hollow • The Husk • Mega Fatty • Mega Maw • Peep • Pestilence • Polycephalus • The Wretched • The Fallen • The Headless Horseman The Forsaken • The Frail • The Stain Big Horn • Rag Mega Bumbino
Chapter 2.5	Reap Creep • Tuff Twins • Hornfel • Great Gideon • Singe • The Shell • The Pile
Chapter 3	The Adversary • The Bloat • The Cage • The Gate • Monstro II • Gish • Loki • Mask of Infamy • War • The Fallen • The Headless Horseman • Mom Brownie Sisters Vis Reap Creep • The Pile
Chapter 3.5	The Siren • The Heretic • The Visage • The Horny Boys • Mom • Mom's Heart
Chapter 4	Blastocyst • The Bloat • Conquest • Daddy Long Legs • Triachnid • Death • Lokii • Mama Gurdy • Mr. Fred • Scolex • Teratoma • The Fallen • The Headless Horseman • Mom's Heart • It Lives Sisters Vis • The Matriarch
???	Hush
Corpse	Chimera • The Scourge • Rotgut • Mother
Chapter 5	Satan • Isaac
Chapter 6	??? • The Lamb • Mega Satan
The Void	Delirium
Home	Dogma • The Beast • Ultra Death • Ultra Famine • Ultra Pestilence • Ultra War
Greed Mode	Ultra Greed Ultra Greedier

The Binding of Isaac: Rebirth
Achievements	Attributes	Bosses	Cards and Runes	Challenges	Chapters
Characters	Co-op	Items	Item pools	Monsters	Objects
Pickups	Pills	Rooms	Seeds	Transformations	Trinkets