This is a story related trophy and cannot be missed. For this trophy, you'll have to turn on the light pillars to awaken all three horses. Once you have all the light pillars turned on and aimed towards the three horses, rotate each of the three pillars so the light hits each of the horses, then go to the shiny spot on the ground and press the Circle Button button. Doing so will start a cut-scene as well as unlock your trophy.
Solution taken from Playstationtrophies.org. All credit goes to them
http://www.playstationtrophies.org/game/god-of-war-chains-of...