When an action removes N Health worth of Invaders scaling with a condition (e.g., the number of Dahan for Inspire the Release of Stolen Lands), do the Invaders have to be removed in batches of N Health?
When an action removes N Health worth of Invaders scaling with a condition (e.g., the number of Dahan for Inspire the Release of Stolen Lands), do the Invaders have to be removed in batches of N Health?
No. Total up the Health limit on the removal and then remove a set of pieces that's at or under that limit.
This only applies if the Invaders are all being removed as part of a single action (e.g., in Inspire a Release of Stolen Lands or Wavering Resolve). If "each player" is removing Invaders (e.g., Seek Safety, Belief Takes Root, Depart the Dangerous Land), then that's one action per player – the totals can't be combined.