How do I acquire a Chrono Core?
Chrono cores can be found by attacking Level 8 Plains or higher.
Important: You can only get a Chrono Core in a Plains by sending attacks with a Great or Elemental Dragon. One of your Dragons must be present to acquire a Chrono Core.
There is a greater chance of acquiring a Chrono Core in higher level Plains. In other words, Level 10 Plains have a higher probability of dropping a Chrono Core than Level 7 Plains.
Chrono Cores can appear in Plains you have already defeated, so feel free to attack the same Plains multiple times to increase your chances of finding an Egg.
You can also get a Chrono Core by purchasing a Chrono Ark Item in the Shop.