Dagger of Loki

The Blade of the Phoenix has been in existence for roughly 500 years, it was in the possession of Rook'shir, an intergalactic out law of the Shi'ar. Rook'shir was bounded to the the cosmic power of the Phoenix Force. Using his gigantic Blade to focus the power, he destroyed worlds, killing billions. Rook'shir was destroyed by the vaulted Shi'ar Imperial Guard. His power and essence remained dormant in the Blade, which can only be wielded by his blood relatives.