The Protron Cannon Indigo is a weapon from Tyrian.
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New to Tyrian sector 2.0, this is a powerful option available for any ship.
The Indigo fires out dual IR Protron bursts in rapid succession and works well when not confined to narrow quarters. Unfortunately, the prototype Indigo was last seen in a secret region of Episode 2, protected by a fleet of crystalline life forms called the Inzia in Galactic Tongue. To retrieve the device will certainly be difficult, since the Inzia surround your ship with crystalline mines which will confuse the Indigo system.