Originally Posted by
Rosenstrauch
From what I understand, during those moments where the WoL appears in the aetherial sea, our physical body remains in the location they were at before such scenes. In other words, while the Word of the Mother is chatting with us, our body is just sort of hanging out in the Antitower.
So while we probably could travel to other worlds this way, we'd have to leave our physical body behind to do so. Only the Exarch has managed to circumvent that limitation, both in his initial departure from the Eighth Era to the First and in his subsequent summoning of the WoL from the Source to the First. Even then, his first half-dozen attempts all backfired horribly—The first five attempts ended up pulling the Scions' souls out of their bodies instead, and the sixth attempt left the WoL's comatose body just a few fulms away from Elidibus-Zenos.