Dragon Fear has a very high negative resist mod. You can still see it here:
http://lucy.allakhazam.com/spell.html?id=789
This would have been even harder to resist in classic, -150 is more detrimental to a 255 cap than it would be to a 500 cap.
I'd also like to point out that as a non-tank the only mob I ever remember eating fear from was Klandicar later on when he was rooted.
I'm looking into the stun breath
#velioustactics