Final answer:
To breed the Opal Dragon in DragonVale, combine the Lightning and Cold elements. Use dragons like the Storm Dragon and the Ice Dragon for breeding. Multiple attempts may be needed.
Step-by-step explanation:
To breed the Opal Dragon in DragonVale, you will need to combine the Lightning and Cold elements. You can use dragons that have these elements, such as the Storm Dragon and the Ice Dragon, to attempt breeding for the Opal Dragon. It is important to note that the breeding process is based on probabilities, so it may take multiple attempts to successfully breed the Opal Dragon.
Learn more about Breeding the Opal Dragon in DragonVale