Crystal and Control

Crystal and Control is the 7th world event, it involves both Seren and Zaros. Zaros wants to control everyone on the world, but Seren doesn't want to give him control over her elves. Seren on the other hands wishes to take control over the world gate, which is so close to her empire, to prevent Zaros for using it to summon any dangerous beings, like soul devouring demons.

Starting the event
To start the event you either talk with Soran or Endwyr, who are located at the Zaros camp or Seren camp south of Varrock and south of Port Sarim respectively. You can also talk with Azzanadra and Char, who are both in the camp north of the world gate or to Baxtorian, Arianwyn and Lord Iorwerth who are both south of the world gate.