I've gone back and checked to see if I cleared the whole map and I have.One battlefield I can't get in yet,it's locked,but I still can't seem to find the six one.Grim I found the one you were talking about,the one that looked like it was hidden.I can't seem to find all the keys I need.I've been able to clear out 4 battlefields so far.Thanks for the replies Grim,but I guess I still need some more help.
Puck