Karrthus, called the "Tyrant of Jund", is a dragon Ajani Goldmane encountered on his first planeswalk. Shortly after their encounter, Sarkhan Vol fooled him into thinking that Ajani was his kill in order to spare the leonin's life.
Shortly thereafter, Nicol Bolas captured Karrthus, along with four other smaller dragons, mindwiped them all and brainwashed them into serving Sarkhan and him. He then handed the dragons over to Sarkhan for the battle against Naya and the wresting of the Obelisk of Naya.
- Brady Dommermuth, Doug Beyer, Jenna Helland et al.. (Wednesday, October 15, 2008.) “Flight of the White Cat, Part 3”, magicthegathering.com, Wizards of the Coast.
- Doug Beyer. (April 22, 2009.) “Jund's Trump Card”, magicthegathering.com, Wizards of the Coast.