Any melee weapon is now enchantable over Sharpness 5!
Find the special anvil at Minewind blacksmith’s, near spawn (XYZ -45 67 300).
Anvil controls are self-explanatory, but beware: every enchanting attempt has a chance to destroy the item. You can decrease this chance to as low as 0% by adding extra sacrifice (add or remove sacrifice by clicking plus and minus buttons respectively). Higher sharpness levels require more, better sacrifices to have 100% success rate.
When your weapon reaches level XI (11), it becomes classified as a God Item and cannot be repaired via normal means.