They move identically to regular Boom Flies, but will shoot 6 projectiles on death instead of exploding. The projectiles always have a set trajectory pattern so you can position yourself for safety.
Eternal Champion Behavior
Eternal Red Boom Flies shoot an extra wave of significantly more tears on death as well as the first wave of 6.
- From the original game, if Isaac kill a Red Boom Fly before it moves, it will explode like a normal Boom Fly.