Indeed. Speaking of which, it sounds like their talons should be treated as adamantine weapons for the purposes of overcoming DR.
Modifying the catoblepas' death ray...
Death Ray (Su): An apollyon can project a thin, gray ray up to 100 feet from its eyes. Any living creature struck by this ray takes 1d100 points of damage (Fort DC x half). After striking one target, the ray dissipates and cannot be used again for 1d4 rounds. The save DC is Charisma-based.
Don't like save or die on this one--I like the straight damage. And I thought that the majority had already come out in favor of it. The ray acting like a death effect for the purposes of spells makes sense and would make it harder to come back from (resurrect, instead of raise/reincarnate), but we could make it worse and have it only be miracle/wish.
Making the victim harder to bring back to life's a good idea, maybe require a level check vs DCX for the cleric casting the resurrection?