You need the Aether mod.
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you must go to the aether by getting the aether mod mine some purple stuff and craft it like you craft a sword
You can make a diamond sword in Minecraft by placing two diamonds above a stick in the crafting table.
You can't, unless you're using mods.
Have a sword. make an enchanting table. Have levels. Put the sword in the enchanting table. Click a available enchantment. BOOM a better sword. Bookshelfs gives you better enchantments for higher levels
Twilight sword