Minions can't enter this site on the ground if there's already a minion atop.
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You have a minion on my Mountain Pass. Can I summon a minion on the site?
Your minion attacks my Mountain Pass. Can my adjacent minion defend?
What does 'enter this site on the ground' mean?
I have a minion on my Mountain Pass, and a voidwalk minion on an adjacent square. Can I move from the void to Mountain Pass?