[rancor26]

I'm not sure did i understand you correctly but if you were talking about "charm" ability it only works on humanoids not for example on executioners.

Or were you talking about demoness being able to cast spell on executioner while feared? fear basically means he just can't attack enemies higher level than himself it doesn't say he wouldn't be able to cast spells.

Or were you suppose to say "demons" when you said "executioners"?

And as i said already how did demoness seduce your executioner (or demon) she doesn't have any kind of ability that would prevent demons or executioners from casting spells.