Druaga refers to a Babylonian/Sumerian deity, who was ruler of the underworld. Druaga is occasionally used as an alternative name for the evil Zoroastrian deity, Ahriman, enemy of the god Ahura Mazda.
The Namco video game series The Tower of Druaga pits the hero Gilgamesh against the demon Druaga whilst on a quest to obtain the Blue Crystal Rod and save the Priestess of Ishtar, Ki.[1]
Also, the game Tales of Phantasia has several Druaga legend artifacts, including the Blue Crystal Rod.[2]
In Advanced Dungeons and Dragons Druaga is part of the Babylonian pantheon and is the god of devils.[3]