Flies are very common enemies in the Binding of Isaac and its expansion Wrath of the Lamb. They almost always appear in groups. They can fly over obstacles, and most do damage on contact. They are fairly weak, are easily pushed back by tears, and often only require a couple of hits to take down. They often spawn upon the death of other enemies, such as the bosses Duke of Flies and The Husk, Hives, and Mulligans.
There are two types of flies in The Binding of Isaac: (Three with Wrath Of The Lamb DLC.)
Black Fly Edit
Black flies buzz around the room randomly, often moving away from the player. They are harmless and cannot even hurt you on touch. However, they can turn into relatively dangerous Pooters if there is poop or Fireplace
Attack Fly EditAttack Flies are red and black flashing flies that will follow the player relentlessly until killed. They move very slowly, allowing you to comfortably outrun them.rocks and other obstacles that will usually block the player and their shots, so you need to keep that in mind.
They deal 1/2 heart damage on touch and require two Strength 2 tears to kill, their small size making them relatively difficult targets. They're also small enough to be pushed back by your tears, however, and if you stay at the very top of the room, flies will not be able to reach you due to the knockback effect unless there are exceptional numbers of them.
If you have the Skatole, they will all turn into harmless black flies.
Large Attack FlyEdit
These have the exact same behavior as regular attack flies, move at the same speed and deal the same amount of damage. However, they're larger and take more damage than regular attack flies. They're also unnaffected by Skatole.
Two attack flies joined together. They deal 1/2 heart of damage and split into two regular attack flies at death unless killed in a single hit. Their split is very wide and unpredictable and can easily shave off half a heart. It is recommended to kill faster flies and other small monsters before it as the two flies it spawns are actually more dangerous in many ways. Running between them just as they split is also a very good way to dodge.
While holding the Skatole, killing this enemy generates no flies.
The Eternal Fly is a very small white fly that was added in the Wrath of the Lamb. They can be found on any floor in the game. They will initially circle Corn Poop or enemies like Holy Leech and the Hanger and will not change movement patterns until their hosts are destroyed. Before that, they will deal 1/2 heart of damage if you touch them, but are immune to damage until you destroy the host. When this happens, they convert into very large attack flies, who have double the health of large attack flies, taking six Strength 2 tears to die. They're immune to the effects of Skatole.
If Eternal Flies are circling Corn Poop and there are no other enemies around, you can leave the room at will. This is true even if they have already been converted into large attack flies: they will simply disappear when you return into the room.
Bug: If the host is destroyed while it is frozen, such as through the use of Mom's Bra, the fly will simply sit in the same spot without doing anything, being pushed without slowing by any tears shot at it.
Blue FlyEditA friendly attack fly which will circle the player and charge the closest target once within a certain range.
- During the credits, the fly, P. Maw, and Blastocyst's image are the only ones that have animation.