Board Thread:Rebirth: Applications/@comment-4080775-20141116215302/@comment-4080775-20141123193728

Ace can use the sword to create an opening in the Fabric of ST and can enter it for transportation, so yes, he can use it on himself.

It can disrupt the coordinates of other ST techniques, by disrupting the space the target is trying to use them in. Depending on the range of the opponents SP technique, it can have an effect on their attempts at using it.

As far as other dimensions go, that can get complicated, due to the rules of that particular dimension. But the abilities of the sword will still apply, unless those rules simply don't exist in that particular dimension.