I trust this makes for... interesting weekends? lol.
So in Tamrirel, is it Ayahaus Tree Sap?
No, because http://en.wikipedia.org/wiki/Ayahuasca is an Earth term. "aya" meaning spirit and "huasca" meaning vine. I was just using it as an example. It's a word in whatever language the Bosmer speak, and it's probably a native sect of whatever language they speak any ways. I have no name thought up for what Vedaa was drinking. I'm just imagining it's a brew the natives who live in the dense forests of Valenwood brew up for ceremonies from the plants, vines and roots of a particular flora. Don't ask me which ones because not even the developers have given Valenwood much detail or attention as far as the environment. There's a cool video I like about ayahuasca by 1200 micrograms http://www.youtube.com/watch?v=2flbDkq9d1k. You enter a special, magical dimension... the dimension of the spirit world. So in TES, you may enter pocket realms in Oblivion by expanding your consciousness to extreme measures. After all, Oblivion is just a dimension in the same coordinates as Mundus, just in a dimension mortals cannot enter, see or comprehend from the dimension they (Nirnians) are in. Much like how we as Earthlings cannot comprehend the 4th or 5th dimension, although we can certainly see the shadow of a 4-D hypercube, much like how a 2-D entity can only see the shadow of a 3-D cube using 2-D projection. Okay, this is way off topic. haha