this is one of the most frustrating puzzles ever. i did it once before and just ran all over the pressure plates and the gate opened but this time even with serana i cant do it. i have tried slow time but that dont work so if anyone know how to open this dang gate i would appreciate it.
The one where you have to light up all the tiles? I found it's easiest to use slow-time and then sprint back and forth. (I was level 80 when I did it with a lot put into stamina and all three words of slow time) Although if you are continuing to have issues, you can use telekinesis to grab the ring.
Actually I didn't think it was hard at all after I knew what to do. I was walking over them in patterns and stuff before I knew I just had to light them all up fast. After I knew about that I just sprinted and did it on my first try. Make sure you have the perk that makes your armor weigh nothing and not slow you down at all. If you have that perk then you shouldn't have to use slow time or anything fancy.