how about if you make the appropriate Knowledge check, the target has a bonus to beat the will save. example, making a Knowledge (history) towards a dragon who has lost their mate, then manifesting this power will give the dragon fond memories of their long lost mate. (I think that dragons, like swans, mate for life and will rarely find another mate if the previous one dies)
this gives me an idea for a silly message board game. with your permission, may I use this as a SMBG?