Oh, and shady, you see on the second screenshot there, where you are looking at your hero screen? You have a LOT of magic runes (The blue ones). There are three different skill trees to put runes into. Try clicking on the "Mind" or "Magic" buttons in the bottom right of that screen to learn other skills.
Lastly, Hero's, and TROOPS GUARDING NAVIGATION MAPS are always the hardest stacks on an island, and may require you to come back and get them later. Also, as the game progresses, you will find that Strong and maybe even Very Strong stacks are completely killable by you!
Good luck!
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