10 perfectly sphere-like stones containing ancient spells of much power and much use to those with wits, courage and intelligence.
This sword has had many names. Dreamdweller is just one of them. It has also been called “The Moon’s reflection”, “Soul’s guide” and many others… The sword dwells it’s power from the character, from his essence, his dreams and thoughts…
When you sleep, your soul briefly returns to the place where it was created/goes to when it dies, and seeks nourishment. Everybody's soul is created with a little link (or you could say a greater entity calls it back) to that place so that it can return easily, but upon death, the soul returns via that and annihilates the link as if returns.
Also, as an added thingy, you could say the entity supplying the link, or residue of the links themselves, (whichever) is the source of all arcane power.