Long ago, the ancient Realm of Zaterra was ruled over by a patriarch, a wicked warlord by the name Tetsurri who was born with a cruel nature. He made the entire Saurian kingdom into a desolate world under his rule. After his death, his own beating heart filled with such negative energy that it crystallized into a ruby-like demon stone, hence the name Gem of Tetsurri. The Gem became a legend to the point where Raiden believed it was a myth.
- Defenders of the Realm - The Secret of Quan Chi