Teleportation works like star trek (fade out/fade in).

We appear in a sphere of black void, with a colored tube that has been severed. We are falling towards a black inky vortex. We fall through. Outside we see the distorted form of an enormous demon, holding the other end of our (original) teleportation tube. He leers at us. We all raise our defenses as we can (spells, weapons, magical items).

LordOrbruth (GeldarTheBard recognizes them). May be related to TheEntropy.

To the left we see a dark angel walking through a field of glowing bodies (souls?). Wearing leathers and with a bloodied face, it is reaching down and harvesting the souls, severing them into parts; the souls regenerate and die again and again.

The black portal slows even more. Vague shapes begin to form around us into a volcanic chamber/platform with a unknown teleportation circle etched on the surface.