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My apologies, the Destroyer won't reach them, but the Devastator with the 3rd tactic reaches them perfectly. It's just that everything was written in a hurry and from memory in 5 minutes. And it's not Stone Skin, but naturally Petrification. Basically, the enemy (in this case, the Haven) loses 2 Shimmers and the Sun Knight; they can only attack the Devastator due to its "Summoning Appearance" ability, and he is protected by petrification and is invulnerable. But we won't get anything from a similar maneuver by the Sun Knight except for his quick death.
Although in a battle, you can break them into a couple of stacks by throwing out the useless broodmothers.
And about the knights, sorry, I messed up, I somehow thought they had the same ability...