Forbidden and forgotten spell. Early necromancy spell that gives and seizes bones a life. First attempt to rise skeletons but it was failure by most parts. 

If spell used on just skeleton it shatters it's bones into pieces, when spell used on living organism with skeleton inside - skeleton becomes alive and tries to escape from flash of it's owner and shatters into pieces after five minutes that usually enough for a skeleton to get out of body. Due to the terrible and frightening fate of the spell's target, it was banned even among most necromancers, although some still use this dreadful spell.

For a success, the opponent must be weaker and less experienced in magic, to be connected to skeletons (be skeleton or have bones inside) and the opponent must be in the stan, spell produced by direct touch