Board Thread:Dragon City Questions & Answers/@comment-8951121-20130531054452/@comment-5659983-20130602114642

Try to breed Pure Dragons.

If you breed 48 hours dragons, you'll get 2400 horns.

It's a tip ;)

Horn List:

12 hours: 720 horns

24 hours: I don't know xD

48 hours: 2400 horns