|The Recollection Of Paulus Aurelianus is a sword under the Temple Church in the northern part of the West-End district. The earliest chance to go there is during Chapter 5 (story takes you there). However, you cannot actually unlock the weapon until Chapter 6. There is a guy called Usher Talltree (fortune teller) sitting there. In front of him on the stairs are four pressure pads -- they make a noise when you step on them. Behind the wall by the pressure pads is the sword. To unlock the sword and get the "Bloody Roots" trophy, complete the following steps:
Step 1: Accept Usher Talltree's "Pandora's Box" side quest (guy sitting under Temple Church). He sends you to the theather to get his notebook. Kill the two guys upstairs in the theater for them to drop a key. Then, use the key on the safe downstairs to get the notebook. Note: Do not read the notebook, as it voids the next step and makes the puzzle unsolvable.
Step 2: Hand the notebook to Usher (without having read it). He will reward you with the "Origin Of The Brotherhood" collectible. Read this collectible. In the top right corner of it are four symbols representing the pressure pads. The order in which you must step on the pressure pads is: Fish, Circle, Square, Circle, Fish, Rhombus. It is random for every player which symbol correlates to which platform. That is why you must get the collectible from Usher to figure out the solution that applies to you.
Step 3: (optional): If in doubt, go through all your collectibles. On some of them will be a symbol from the "Origin Of The Brotherhood" collectible and some dots. The number of dots represent the order in which you need to step on the pressure pad. There are six total moves. So any random 6 ouf 30 collectibles will have a clue.
Step 4: Step on the four pressure pads six times in the following order: Fish, Circle, Square, Circle, Fish, Rhombus (if this does not work, look through all 30 collectibles for the order in your game).