I would add:
Be aware that elementals create an effect when they die/unsummon. Be aware you can use this to your advantage.
Charm and Summons are your friends. Absolute bestest friends. Hide behind them, let them cause significant enemy AP wastage. If you can't hide behind summons, hide behind your toughest character.
An enemy that can't use AP is a good enemy. Know your CC, use it wisely. Touch spells are significantly better value than long range ones for pure CC. For those hard to reach enemies, drain their willpower first.
I, however, wish the game posed a significantly greater challenge post Cyseal.
