Solve all seven Suger's Legacy riddles in the 'Dead Kings' DLC to get the very powerful sword called Eagle Of Suger and the 'Defender Of Franciade' achievement. Carefully aim for the next grappling point until you can pull final lever to remove the last part of the cage around the Thomas de Carneillon armor. Also, avoid the hot steam spouting from the grappling points to prevent falling. The path that you need to follow is not difficult, but the Back Eject move is needed to reach the highest point. You must reach the high balcony by climbing and jumping from one pillar to another. The Cella Vaporis: Eighteen fragments from the Nostradamus Enigmas are required to solve this puzzle. The next layer of the cage around the Thomas de Carneillon armor will disappear. Press the switch on the left side three times, press the switch in the middle once, and press the switch on the right side three times. The Cella Astri: Ten fragments from the Nostradamus Enigmas are required to solve this puzzle. After solving the puzzle, the first layer of the cage around the Thomas de Carneillon armor will disappear. The Cella Constellatio: Pair each symbol on the ground to the matching symbol on the pillar.

Equip the Medieval armor to get the 'From The Past' trophy.

It is listed as 'Thomas de Carneillon's Master Assassin Outfit' under the equipment menu. You can equip the armor at the character customization screen. Solve the three new puzzles to unlock the Medieval armor. Solve all 18 Nostradamus Enigmas, then use the 18 fragments you received from completing all 18 Nostradamus Enigmas on the Nostradamus Disc in the armor room of Café Théâtre to unlock three new puzzles.

Ac unity heads will roll sync points