Cruel knife is only useful if you have a ton of elemental damage.
This is because the weapon is so fast it hits with that elemental damage at a fast rate. The weapon damage, however, is so low that you would need an insane amount of strength to get a decent amount of physical damage out of it.
Cruel knives with lots of elemental damage were primarily used for their usefulness in interrupting mobs/bosses anyway. They were never a real viable option for leveling.
Re: Cruel Knife or Meteoric Dagger
#11Belenus
Elementals
Kiyarah - 222
PiercingHeart - 193
Kiystroyer - 139
Hexi - 137
Alleviate - 135
Elementals
Kiyarah - 222
PiercingHeart - 193
Kiystroyer - 139
Hexi - 137
Alleviate - 135