This mod adds The Legendary Sword from MrFudgeMonky's Annoying Villagers series.
The Sword itself is very powerful but still in-line with vanilla balancing. The sword is lore accurate and includes all of its enchantments, including custom ones.
You can craft the sword with Pure Enchanted diamonds, an enchanted golden apple, a amethyst shard, and a reinforced stick.
Pure Enchanted Diamonds are obtained by smithing Enchanted diamonds.
Enchanted Diamonds are obtained by smithing regular diamonds.
A reinforced stick is crafted with obsidian and iron nuggets and a slime ball
JEI (Just Enough Items) or similar is highly recommended.
I don't own the texture or idea, I am simply putting it into mod form in modern versions of Minecraft.