How about vs Monstrous Creatures (MCs)?
Or if that's too broad
Vs Carnifex's
Vs Hive Tyrants
Vs Wraithlords
Vs Avatar of Khaine
Vs The Nightbringer
Vs The Deceiver
Vs So on and so forth

This is especially important for enemies with Toughness around 8 or with special nasty rules built in.