Formed from the combination of the Mini-Con Space Team (Astroscope, Payload, and Sky Blast), it is one of three powerful weapons that also function as the keys to fully awaken Unicron from dormancy. The other two weapons are the Star Saber and Skyboom Shield.
Curiously, the Requiem Blaster seems to be able to fire numerous forms of energy. Some seem to create a gravitational pull towards the main ray of energy, while others are the simple purple rays of energy. It's portrayed as the most powerful of the three Mini-Con weapons, even though when it was used against the Star Saber and the Skyboom Shield on two occasions they weren't destroyed by it.