Board Thread:General Discussion/@comment-108.220.53.228-20140217225253/@comment-66.62.115.199-20140217235825

You encounter either Malady or Eir when you're walking around in the campaign, and you have to defeat them for a chance at their card dropping.

If no limited enemy card drops, then the drop rate increases by a certain amount of percent. You can layer the percent increases up to +5%, and it lasts for 10min or until the next limited enemy is found and defeated, then it resets to 10min.

Higher the area, higher the encounter rate.