I do know all that stuff about upgrading;)
I just didn't thought about that somebody could have attacked me while I was upgrading my creature. Now when you said that, I've checked my Battle Log and I was attacked then.
Thanks for explanation;)
I've just wanted to upgrade my Grassan, but he didn't upgrade... I've lost only Vitality points, not Value/Action/Exploring points. Can somebody tell me what's the problem ??