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Iron Bigsword is an craftable weapon added by Better Dungeons. There is a Diamond Bigsword variant that is named Iron Bigsword as well. It has a powerful special attack and can be crafted using a vanilla minecraft crafting table.
The special attack is done by right clicking and holding, and does AOE damage and increases its damage when charging for longer time. It seems to have wider range than a normal attack.
It is obtainable as loot, and is sometimes carried by Walkers, (Walker Barbarians). Visit one of their settlements, and check all the chests for your Big Sword!