You must activate one of them.
FREQUENTLY ASKED QUESTIONS
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Round, turns and activations
What happens when it is my turn and I don’t have units on the battlefield (for example, they are Scout or Ambusher)?
Can a unit end its movement adjacent to a friendly unit?
From the rulebook: “Your unit cannot end its movement in contact with other units.”
Pass
It's your activation and you don't have any units you can legally activate. What do you do?
If none of your units can activate this turn, you must pass. If your turn comes again and you still don’t have units you can activate, then the game finishes.