The Gemini is a boss in The Binding of Isaac: Rebirth (TBOIR)
The Gemini is a twin-monster, with one big baby and one little one.
The larger Gemini charges towards the player, while the smaller one shoots blood bullets
- The larger twin occasionally stops for breath, which is a good chance for the player to counter-attack.
- If you kill the large twin before the small one, the small one becomes enraged and charges at the player.