[Gregstrom]

Soul Drain won't work on lifeless, so it's great for supporting Ermor's armies of the dead. Astral Tempest won't affect mindless, so again supports use of undead chaff and R'lyeh's slave troops. Unraveling doesn't hurt non-magical units, so most national troops are immune (although you'd better give all your mages as much MR as you can). They're mostly niche uses, which is one of the reasons they don't rank above Master Enslave in most people's minds.