7 Rarity of Weapons / Items Example. (Dota 2 Inspired)
Common
Uncommon
Rare
Mythical
Legendary
Immortal
Ancient
On the NPC you can Increase the Rarity of your Items with the requirements of some items.
Example Effect of Rarity
Common Knife
Attack + 3
Uncommon Knife
Attack + 5
Rare Knife [ Color Blue ]
Attack + 7
Mythical [ Color Violet ]
Attack + 10
Legendary [ Color Purple ]
Attack + 15
Immortal [ Color Gold ]
Attack + 20
Ancient [ Color Red ]
Attack + 30