Game Mechanics: Nullify Magic

[Treats]

Cancel Magic - No Resist Check
Annul Magic - MR
Pillage Enchantment MR + 5
Alenia's Disenchanting Melody (Bard) - No MR check
Nullify Magic - MR + 5
Recant Magic - MR
Strip Enchantment - MR + 25
Taper Enchantment - No Resist Check

All of these are listed as Positive (Beneficial) spells except for Alenia's and Taper Enchantment. I don't know how this worked on live but I'm assuming if these spells are marked Beneficial here they will be broken. When trying to cast the spell on a mob/duel PC you would just receive the message "Your spell would not take hold".