I think that's how you spell it, when I came across them, I jotted it down, cause I knew I'd never remember.
I was doing the Morag Tong quests. I was supposed to kill Brilnosu Llarys at the Hlormaren Stronghold. I got there, there's two buildings. One has a door to the lower level of Hlormaren, and the other is a separate building, I don't recall what it was named, but it was on the same platform, and it's the only other one there. I went in there first and there's these two weird things (sort of reminded me of obelisks in a way) with red light swirling around them, and they were called Propylons, and when I went up to them and tried to use them (pressed space bar) it said you do not have the index for this Propylon.
I've played a good bit of Morrowind, and have never come across these things before (guess I didn't know the game as well as I thought *grins*) and have no idea what they were, and got really curious. So, I thought I'd come on here and ask