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It depends on what the hill was designated as at the start of the game.
If it was called a 5+ piece of cover, then everyone under the blast gets hit, and no cover saves unless 50% of the models are LOS obscured
If it was called 5+ area terrain, then everyone under the blast gets hit, and get cover saves
If it was called a 5+ ruin, then your friend could argue the multi-level rule. If it was called a "Ruin", but didn't discuss levels, then decide with a 4+
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