Chapter 7 - Act 4 - Breed Farsight Dragon with another dragon
Breeding Farsight with a basic yellow-element or single cosmic-element dragon will give you four possible outcomes; Venus, with a 4-hour timer, Genie, with an 8-hour timer, Music, with a 10-hour timer, and Trickster, with an 18-hour timer.
Breeding her with dragons of any other element will not only increase the number of possibilities but will also add outcomes with timers higher than 18-hours.
If you breed her with a Diamond dragon, Venus gets taken out of the equation, but you add Gold, Gossamer, Anubis, and Quasar.
I'm going with Cosmic, but I bet they dump a Trickster on me