Thrantax the Mighty

Thrantax the Mighty is the ghost who players must bring under their control in the Merlin's Crystal quest. If they fail, Thrantax will attack them.

Trivia

 * Interestingly, while one player summons him to do the quest and is talking to him, another player can fight him and actually kill him.
 * He does not count toward ghost Slayer assignments.
 * In RuneScape Classic, Thrantax appears as a demon rather than a ghost.
 * Even though he is a ghost, the amulet of ghostspeak is not needed to talk to him.