Some beings, most often Shadow Creatures, can use Shadow to inflict curses onto people innocent and guilty alike.
Although the negative emotions the caster charges it with play a part, the victim's emotions are the primary source of power for the curse, and may even strengthen it past the caster's intentions, to the point of lethality.
(It is said that once, a Shadow Creature had cast a minor curse on a young lad to cloud his eyes with inky black tears so he could not see their true form if he dared turn around. But the lad felt so much guilt for going back on his word that in those last moments those tears streamed down his face alongside blood)
Shadow Curses (Specials)
Although the negative emotions the caster charges it with play a part, the victim's emotions are the primary source of power for the curse, and may even strengthen it past the caster's intentions, to the point of lethality.
(It is said that once, a Shadow Creature had cast a minor curse on a young lad to cloud his eyes with inky black tears so he could not see their true form if he dared turn around. But the lad felt so much guilt for going back on his word that in those last moments those tears streamed down his face alongside blood)