This trophy guide will help you complete the "Bloody Roots trophy", get the True Dragonbane sword, and also get the "Recollection of Paulus Aurelianus" collectible. I've tried to make this is comprehensive and thorough as I could, sorry if despite that it seems a bit complicated. Because it will. Because it is. But I've tried to simplify it as much as I can.
The sequence for stepping on the pressure plates is:
FISH, CIRCLE, SQUARE, CIRCLE, FISH, RHOMBUS. The first person to conclude this was the same sequence for everyone and post it online and who deserves all the credit was / powerpyx
UPDATE: Redditor LotharBoin posted an updated guide on other possible combinations which you can use without getting Usher's hints. I haven't tested these, but they may work for you:
/ way_to_get_true_dragonbane_without_glithes_or
Oh, and remember: Don't read the damn note book when you get it out of the safe! That's the most important thing of all!
Enjoy!