Where is [Spoiler]?

[Anonymoose]

I'm not sure the void counts as inter-shard travel. The shard that was there is now not; that's the point. Usually, the dimensional planes have a membrane between them that's reinforced from both sides by two separate aether-rich worlds. Breaking through that barrier is nigh impossible, and (as far as we know), the instant you actually manage to break through, the distinction between the worlds is undone, the membrane collapses, and the "reflection" is "deleted".

The way we've seen this circumvented thus far is to die, transcend the flesh, and somehow ride through the crystals outside of the Source, into a transitional something and then into another shard.

With the Thirteenth, you only need to cut through the Source-side membrane and swagger directly into the empty, and even that takes a profound amount of energy.