I went through the portal to enter the Writhing Fortress, but apparently it was a bugged instance. I left and reentered, apparently to a working instance since there were new dialog options, and tried to follow the hints being called out by the NPCs, but I still have no idea what I'm supposed to be doing. What we need is a walkthrough or guide that explains what to do. (And I dislike playing games using walkthroughs, because I feel like that defeats part of the fun of discovering things in the game, but in this case I just feel so clueless that I don't know what else to do.)
Some tips that might be helpful include:
(1) How can we tell if we're in an instance that's bugged versus one that's working?
(2) Once we enter a working instance, what are step-by-step instructions on what to do next?
(3) For instance, I can repair a ballista and use it, but what exactly am I supposed to be aiming it at? Presumably at one of the pylons, but which part? The base? The thinnest part of the pylon? The very top? Is there supposed to be sone kind of health bar, like on a keep's front gate, that shows how close a pylon is to being destroyed?
(4) Lead the infernium to the gate? How do I lead the infernium? It won't move and there's no way I can interact with it.
(5) Grapple points? Where am I supposed to be grappling to? I found an instance where I could grapple between rocks that had ballistae on them, and I could repair the ballistae using parts dropped by the Daedra, but then what am I supposed to be shooting the ballistae at?
(6) Defeat the storm callers? Where are they? None of the Daedra in that area had any kind of "storm caller" label on them.
(7) Anything and everything else.
I've fought mudcrabs more fearsome than me!