A Dark Bomb was planned to be a powerful combined weapon created by laying a Power Bomb while the Dark Beam was equipped, releasing a field of dark matter tendrils. The tendrils could entangle and hinder enemies, likely functioning in a manner similar to that of the Entangler.
- "The Dark Bomb combines the power of the Dark Beam with that of the Power Bomb. When in Morph Ball mode, press [IMAGE] to select the Dark Beam, then press [IMAGE] to drop a Dark Bomb." —Unused Inventory Data (Metroid Prime 2: Echoes)
- "Samus's Notes:
Dark Bombs release a field of dark matter tendrils when they detonate. These tendrils can entangle and hinder enemies.
Dark Bombs are not effective against Denzium." —Unused Samus's Notes (Metroid Prime 2: Echoes)