I have a bunch of skill books. I haven't been using them on my units because the whole system is cumbersome, so its hard to know what skills to use with who in what squad. Is there a tier list for the skills so I know which ones are good and which ones are useless. For example I see the concentration skill which gives 15% bonus damage, but you don't crit. which imo feels really useless since crit damage does so much more, but for all I know i may be wrong....

Do I need any more squads then the current 23?

This is my first run of the game. I started on warlord and it's pretty much a cakewalk so far. I'm up to chapter 17 now. I even put on permadeath and still too easy. (ok, I cheated a bit here, save/load couple times to avoid stupid unit deaths here and there.). So far there's only one chapter I didn't get rank S, that is the risen ambush chapter. I didn't know the storyline and i took my time to trigger the syunnari trap, couldn't kill the risens fast enough by the end to get S rank. Is the rest of the ga...

Do they stack?

Her second form is just too much for me and I can't enjoy it, it looks so ridiculous humongous. Else I really love this game.