To clarify... area terrain gives you +2 to your cover save when you go to ground in it. It does not grant you a 2+ cover save. Most area terrain is a 5+ so you would end up with a 3+ cover save. Defense lines also give you +2 to your cover save when you go to ground behind it, but they give you a 4+ to start with, so you end up with a 2+ cover save.
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