This unlocks automatically through playing through the game. There is a puzzle though.
You will come to The Order of the Stone's Temple. There will be 5 stained glass blocks on each side of the giant world map. Simply place the Order of the Stone amulet in the stand, next to Olivia.
Afterwards, keep walking towards the back and you will see 5 levers. Unfortunately it seems to be random, so I can't give you the order but the puzzle is easy as can be. The goal being to light all of the colored stained blocks next to the world map. Simply pull each lever, and remember what light they turn on. Some will only activate while another is turned off, so it should not take you long, just a little trial and error.