making the effect like a magical bolt is not that problematic. what is really challenging is hooking up the animation for it. i basically can't help you on that you have to go into the animation files and add to each strike or defense the data for the effect. (if you look at the feary dragon you see what i mean, he has an effect when he strikes: his breath)
i just looked at the bones they are not that different. but keep i mind that the bones of the feary that are not linked to bones of the archer will have no animation, i.e. the hair.
edit: after looking at the files a bit more: you could just take the breath effect of the feary dragon and put it in the attack of the feary.
node 58 (NiTextKeyExtraData) controls the timing on the breath, i just need to locate the breath itself and you can edit the effect which is rather easy.
edit 2: i did not find the effect in the files you gave me, but since i have done a reskin myself there must a file called iceburst.nif or something like that. this file controls how the breath looks (which textures are used, how the particles are generated etc. you have to change this file to make it look more like a magical bolt attack. doing so however you have to keep in mind that the feary will still look like any other melee feary it is only when she attacks or defends that you will see the difference in the animation and don't know if you want to make that much work for it.
i just looked at the bones they are not that different. but keep i mind that the bones of the feary that are not linked to bones of the archer will have no animation, i.e. the hair.
edit: after looking at the files a bit more: you could just take the breath effect of the feary dragon and put it in the attack of the feary.
node 58 (NiTextKeyExtraData) controls the timing on the breath, i just need to locate the breath itself and you can edit the effect which is rather easy.
edit 2: i did not find the effect in the files you gave me, but since i have done a reskin myself there must a file called iceburst.nif or something like that. this file controls how the breath looks (which textures are used, how the particles are generated etc. you have to change this file to make it look more like a magical bolt attack. doing so however you have to keep in mind that the feary will still look like any other melee feary it is only when she attacks or defends that you will see the difference in the animation and don't know if you want to make that much work for it.