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The Quicksand only affects ground units. But there are also flying units... you have to watch out for them... If only there was a spell called "air mines."
In this case, the Mantis with its Shackles would be useful. And the advantage of the Sylvan faction is that you can hire Mantises at the portal (or summon them in battle if necessary), and you can summon water elementals... although maybe also in battle... Great, what a choice!
