Fireborn

"I kill whoever I wish to kill. And that includes anyone who defies the power of Spearthrower Owl."

Fireborn, also known as Siyah K'ak, is a major antagonist in Chris Heimerdinger's ''Tennis Shoes Adventure Series. ''He serves as the secondary antagonist of Warriors of Cumorah and a major antagonist in Kingdoms and Conquerors, Sorcerors and Seers, and Drums of Desolation. He is the general of the city of Teotihuacan and the master of Spearthrower Owl and Blue-Crocodile.

Warriors of Cumorah
Fireborn is first introduced through dialogue. Years ago, in an attempt to purge the royal line of Yax-Chaax-Xok, he led a raid on Tikal to murder the king of the Great Jaguar-Paw. He succeeded in killing and raping many members of the royal family, though Lamanai escaped.

Later, it is revealed that Fireborn captured several Nephites, including Moroni, and held them captive at Tikal. The people of Seibalche hear of this and organize a rescue mission to save the captives. However, Kux-Watch deserts his people and goes to Fireborn to warn him. In response, Fireborn sends thousands of soldiers to Tikal to help guard the prisoners. The soldiers try to prevent Lamanai, Apollus, and Ryan Champion from escaping with the prisoners, but they fail.

Fireborn then goes to Seibalche with more of his warriors. He, having heard from Kux-Watch that Lamanai is the surviving son of Jaguar-Paw, deduces that Kanalha is the one who harbored him. He then interrogates Meagan Sorenson, believing her to be a demoness, and asks her where Apollus and Ryan are. Meagan claims that she doesn't know, and that she and her "demon" companions merely came to stir things up. Fireborn states that he is willing to kill anyone who tries to defy the power of Spearthrower Owl, to which Meagan states that the Great Maw doesn't approve. Fireborn insists that the Great Maw has no power on Earth, and that he is the one with power. To prove his point, he murders Kanalha right then and there.

Meagan is shocked to see Kanalha murdered before her eyes. Seeing this, Fireborn orders her execution. Right then, the jaguar Huracan attacks Fireborn and his soldiers. She kills Kux-Watch, injures Fireborn, and fights the surrounding soldiers while Meagan flees. Shortly thereafter, Meagan is found and liberated by Lamanai, Apollus, Ryan, Moroni, and the other escaped prisoners from Tikal.