A new R-class monster (possibly “nullifier”) whose attack cancels monsters it hits. Possibly it does some sort of object cancellation as well.

Enchanter, a monster that enchants your gear when it hits you or when you hit it with a weapon, the opposite of a disenchanter. (Not to be confused with the enchanter rank title.)

Disenchanters’ touch attacks can cancel individual items in your inventory (not just armor) as well as merely reducing the enchantment of armor. Or possibly add a new R monster that has this ability, and leave disenchanters as they are.