The Abyss
I assume you mean the abyss as Nether Void counters spells. If that's what you meant then yes Hexproof protects it. Even though you would choose which creature is destroyed the source of the ability is a permanent your opponent controls and as a result anything with hexproof (or shroud) is not a legal target.
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I assume you mean the abyss as Nether Void counters spells. If that's what you meant then yes Hexproof protects it. Even though you would choose which creature is destroyed the source of the ability is a permanent your opponent controls and as a result anything with hexproof (or shroud) is not a legal target.