Thor: Ranking Every Hammer Worst To Best
6. Earth-14325 - Thorr's Hammer
Similar to how Bizarro is the opposite of Superman, Thorr is the opposite of Thor. Initially hailing from Earth-14325, Thorr was brought to Earth-616 by A.I.M. with the goal of defeating the Avengers. Thorr was a member of the Tyrant Avengers, and his hammer differed a bit from Mjolnir.
The inscription on his hammer read, "Whosoever holds this hammer if he be UNWORTHY, shall possess the power of Thorr." Adding that extra "r" to the name turned Thorr into an evil badass, but he and his evil associates were eventually defeated by the Avengers. They were teleported into another reality, but the hammer remained behind.
Other than the opposing worthiness enchantment, Thorr's hammer wasn't much different to Thor's Mjolnir. This proved to be helpful when Thor lost his worthiness following Original Sin, and could no longer carry his weapon. He could carry Thorr's due to his unworthiness and did so in New Avengers #27.
The new hammer came with some dark and twisted aspects, leading the God of Thunder to don some new clothes, but despite being an incredibly powerful version of Mjolnir, it isn't more powerful than the original.