how difficult you think it would be possible to make a "magic orb" weapon like in this mod for Fable the lost chapters?

http://fabletlcmod.com/forum/index.php?t=msg&th=993&#msg_num_6

Shouldn't be too hard if you know what you're doing in Blender/3DS

I also mean the mechanics for it to work properly.

Just make a weapon and set it as the nif. Should work like any other weapon if you've properly made the mesh.