The Odinsword is far more powerful than Gungnir and Mjolnir. Having capabilities to channel the Odinforce and the life force of its wielder. A Galactus of another universe fed on the sword and it was like eating several planets.
The Odinsword is tremendously old and strong. Forged in ways now lost and capable of withstanding any impact and cut through all know materials, even a Celestial's armor. It can increase its size along with the wielder, channel cosmic energies with the Odinforce being the prime force behind it.