Do you mean your heroes? They die because they can only be used in certain battlegroups like Xulos who can only be in any full-faction BG, or Hrakon who need to be in a Split-Faction BG in order to prevent your stuff from dying right away...

引用自 Diahru：

Do you mean your heroes? They die because they can only be used in certain battlegroups like Xulos who can only be in any full-faction BG, or Hrakon who need to be in a Split-Faction BG in order to prevent your stuff from dying right away...

How do I know which ones can't be used in certain areas?

http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=946636195
Read this. It will helps you in stopping the immediate deaths of your units.