I would use it only for 2 things:
1- Nice prints ^^
2- Practicing attack skills... but it's not so nice sisnce the skeletons don't hit you back :( but if u're in a pvp world and u have a friend, you and your friend can use this rune so that u can attack your friend's skeleton while it attacks u and the same to your friend....
So, basically, only nº 1 is good enough.