Thor Has Traded Mjolnir For The Odinsword in Marvel Comics
This article contains spoilers for Thor #22.
The mighty Thor has traded Mjolnir… for the Odinsword, his father's legendary weapon. For centuries Thor has wielded the fabled hammer Mjolnir, using it to focus his own power as God of Thunder and unknowingly tapping into the additional power of the God-Tempest contained within it. Although his enchanted hammer was briefly destroyed, during Jason Aaron's War of the Realms Thor reforged Mjolnir, expecting it to be more powerful than ever before.
Unfortunately the power of the God-Tempest resided within the sun, and Donny Cates, Nic Klein and Matt Wilson's current Thor run has revealed something went badly wrong when Thor reforged Mjolnir. He didn't just draw in the power of the God-Tempest — but also that of the Mangog, the god-destroying creature Jane Foster's Mighty Thor had cast into the sun as well. All this means Mjolnir has gone rogue, wreaking havoc on an unprecedented scale. But in Thor #22, Mjolnir unwittingly forces Thor to gain a power-up — and claim a brand new weapon to replace it.
Related: Loki Names One Avenger Strong Enough To Kill Thor (And It's Not Hulk)
A badly-wounded Odin has allowed himself to slip away, passing all the power of the Odinforce to Thor. With the Odinforce comes a new weapon, previously known as the Odinsword but presumably to be renamed as the Thorsword. Sometimes known as the «Over Sword of Asgard,» the blade's origin is the stuff of legend and in some tellings the entire universe would die should it ever be drawn. Although its power is insufficient to kill a Celestial, the Odinsword was reforged and has appeared several times since. It now appears to be Thor's new weapon.
The Odinsword's powers have always been ambiguous, and it's
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