The Tetragrammaton Pentagram, in the post right below, I believe to be the most authentic I have seen
for channeling the spirits that come through it. I personally had one on my living room floor 7' 8" and I would slowly walk around it gazing down into the abyss.
It's a different world then ours. The rules are not the same as here. In the abyss are many elementals and
spirits and even Angels. And they are all on the dark side.
You must be careful when constructing one of these portals.
That you don't accidently let something through the portal because sending it (spirit) back into your abyss that you created. might not be so easy. You need to know what your doing
or it can get out of control if you let it.