All of these blades are believed to be made by the creator's bladesmith
The Kura Tamashi is said to get it's power from souls... the more souls the person has the stronger the blade is... this sword is pure evil. Once a Muramasa is turned into a Kura Tamashi... there is no going back.
The Muramase is said to be a sword of good, the Muramase is said to be wielded by Xander at first before he fought Yharon, the jungle dragon. The Muramase can turn into a Muramasa and can be transformed back to a Muramase.
The Muramasa is a blade believed to be made with a war god and Brazilian gods essences, this blade is said to be to sword of bad (but not evil), The Muramasa is said to be the most powerful out of the three Mura swords.