I am posting each of my suggestions separately. I realise that makes a large number of posts, but it ensures that no suggestion gets lost if there are a lot of comments.
Suggestion 11: Only allow 8 heroes as being ‘captured’ or active is too small. I can have up to 25 armies going at once, and end up with more than 5 captured heroes – all which are being ‘returned’ which means I can’t get rid of junior ones to make room for possible intermediate or senior heroes that I might get at the higher level wildernesses. I think at least 10, better yet 15, would be a reasonable amount.