Primitive Screwhead
First Post
I agree that the severing component lies the way of madness 
If I were to try and HR this into being I would focus on applying conditions based on the loss of a limb.. I would not get into the nitty gritty of fingers or horns..
Basically three special effects, choosable by the caster before rolling the attack roll:
Loss of an arm forces target to lose the use of an arm, dropping any item held only with that arm. Additionally the target suffers 1D6 damage to Str. The arm's use is regained when the STR damage is restored.
Loss of a leg or wing causes the target to lose 15' of Speed in all movement modes that limb affects. Additionally the target suffers 1D6 damage to Dex. Target regains movement when the Dex damage is restored.
Loss of the head, instant death. The target gains a +15 to thier Fort Save to avoid this effect.
Critical Hits increase the Fort Save DC by +10....
Fort save based on damage taken..
This ends up with a spell that requires a succesful attack roll, a Fort Save..and a Spell Resistance check {as needed} to operate..

If I were to try and HR this into being I would focus on applying conditions based on the loss of a limb.. I would not get into the nitty gritty of fingers or horns..
Basically three special effects, choosable by the caster before rolling the attack roll:
Loss of an arm forces target to lose the use of an arm, dropping any item held only with that arm. Additionally the target suffers 1D6 damage to Str. The arm's use is regained when the STR damage is restored.
Loss of a leg or wing causes the target to lose 15' of Speed in all movement modes that limb affects. Additionally the target suffers 1D6 damage to Dex. Target regains movement when the Dex damage is restored.
Loss of the head, instant death. The target gains a +15 to thier Fort Save to avoid this effect.
Critical Hits increase the Fort Save DC by +10....
Fort save based on damage taken..
This ends up with a spell that requires a succesful attack roll, a Fort Save..and a Spell Resistance check {as needed} to operate..