To address the question about the tactical combat...
It is not as indepth tactical combat as in X-Com, the tactical combat is a basic tactical combat that you may have found in games long past. Do not take that as the impression that tactical combat doesn't have tactics it does, but don't expect it to compete with a game that is designed around tactical combat (e.g. Total War, X-Com, etc.)
To re-iterate you need only Legendary Heroes (you do not need any other elemental game) to play Legendary Heroes. It is also a Steam Only game.
