For a long time, my thief has been suffering with 'flawless' Nightingale armor, so I decided to do something about it. This mod allows the tempering of Nightingale weapons and armor up to Legendary levels at a grinding stone or workbench. No exploits or cheats required.

Modifying the armor set requires Void Salts, the Advanced Armor perk from Smithing and an armor workbench. The weapons (blade and bow) require an ingot of ebony, the Ebony perk from the smithing tree, and a grindstone. Remember, to smith the Nightingale set up to Legendary levels you'll need a smithing skill of 100%, or use skill boosts (from items or potions.)

**IMPORTANT NOTE**
If you don't see the Nightingale Blade when you go to the grindstone, and it's definitely in your inventory, then you need to get the Unofficial Skyrim Patch.

Since the Nightingale blade seemed to run out of charges so fast, I also modified the enchantment on the blade to last approximately three times longer before requiring a recharge with a soul gem.

I know there are other mods that do allow Legendary improvements to the Nightingale sets. However, these other mods make extensive changes to the stats and enchantments on the weapons and armor. This stays close to vanilla, while allowing the Nightingale equipment to compete with normal weapons and armor that would otherwise do more damage or offer more protection.