Helmet of the Ancients

Pharaohs guard the pieces of the helmet. When you use it on a Small Ruby, it will be enchanted and turn into a Helmet of the Ancients (Enchanted), which has an additional 3 armor. This effect will only last for 30 minutes. According to this book, using a Soul Ruby will permanently increase this value. Obtained through The Ancient Tombs Quest. Enchanting this helmet with a Small Ruby will grant you the achievement Hidden Powers.