I think that this would be a good mechanic to balance a new Champion around sometime.
They should have some type of effort-required Fear or Charm to trigger it themselves, similar to the way 
Ult works with Knock-Ups.
I believe there are enough Fear and Charm Abilities among the 130+ Champions to justify it's niche.
JhomasTefferson2 votesLike, hypnosis or something
Sexy Jack Rabbit1 votesSpell is too niche even so. Knock-ups are provided by over 40+ different champions. Fear and Charm only come down to 6. 5 champs with Fear and Ahri with Charm. I could see an ability that is empowered by the enemy being Feared, like Nocturne. But no Ability that could only be used when the enemy was feared, unless balanced coherently.
JhomasTefferson2 votesThe champ could have a fear also
