A blue fly, with a blue heart above it.
Chance to spawn Blue Flies when you damage an enemy.
Blue fly attacks can spawn more blue flies. (???)
No matter how many flies you spawn, no more than 5 will follow you into the next room.
Familiars also contribute to the addition of attack flies. This can lead to a significant amount of flies on the screen, making most boss fights towards the closing levels a lot more manageable.
- Mutant Spider - Will spawn many more flies.
- Technology 2 - Has a much higher chance of spawning flies, due to Techonology 2's high fire rate.
- Named after the enemy of the same name.
- When combined with Brimstone, it is still possible to fire if the Mulligan was obtained before Brimstone. Need confirmation whether this is true when the Mulligan is obtained after Brimstone. (possibly fixed in a patch)