The New Teen Titans, Vol. 1

Raven is aghast at the horrors perpetrated by Trigon on his homeworld, and learns that he has no intention of abandoning his invasion of Earth despite his promise to her. While unable to persuade the disciples of Temple Azarath to aid them against Trigon, the Titans are able to have them transport the super-heroes to Trigon’s world to battle him anew. The Titans are again easily bested by the demon, but Arella, Raven’s mother, helps her to escape Trigon’s influence and to free her teammates. By combining their magical and scientific powers, the Titans are able to banish Trigon through a dimensional doorway. Arella sacrifices herself as eternal guardian of the gateway against Trigon’s escape.