If the guard is not adjacent to the camp and there are no protected objects or resources yet, then at level 111-117, you can buy a level 7 creature in the camp...
Otherwise, it's the standard progression by weeks, with level 1 on the first week, and so on.
Defense and attack, plus 30%, are you sure about that?
After the hero's defense or attack reaches 10, then 20, 30, etc., the bonus increases by 5%!
Note: The examples provided are the author's opinion.