The Sieghart Mission (Cash) is a mission bought with Cash. It allows the player to unlock Sieghart.
"A mission to unlock Sieghart, the legendary Gladiator of Bermesiah."
"Sieghart, the legendary Gladiator of Kanavan, has returned as an immortal. However, his attitude makes it hard for anyone to befriend him. Prove your skills to Sieghart to make him join you!"