Solution above pretty much sums it up, but just finishing transferring playstationtrophies.org's solutions over to this site, as true trophies needs proliferation with more solutions.
The Keres Wraiths are the deadly minions of Thanatos. These are the most annoying enemies in the game as they're capable of attacking Kratos from underground at long range. Plus they have a rush attack that is hard to dodge or block. This trophy requires you to lower their health until they fall down and have the Circle Button prompt above them. The best method to kill them is to parry with L1 Button when they raise their arms and the yellow circle appears under them. Once you parry, rush in and attack them. Be careful using full combos as you may accidentally kill them without getting a chance to rip out their heart. When the Circle Button prompt appears above their head, quickly rush to them and press the Circle Button button to have Kratos viciously stabs it in the back, ripping its heart out. You can earn this trophy in the story mode of your first playthrough, but if not, visit the Combat Arena found in the Treasures options. Note: It'll cost 75,000 Red Orbs from the Temple of Zeus to unlock the Keres Wraiths in Combat Arena.
PRO tip: Use the arms of sparta: Spear Assault (Air) on the wraiths ( upgrade the arms of sparta to do extra damage) ( hold R1 and press square whilst in the air)
The main problem with wraiths is when they get knocked over they use the extremly cheap grabby slash move that take of 25% of your health(almost)
you cant use spear assualt on the ground as the other wraith will cut you up
hitting them with spear assault from the air means they never get knocked over limiting them to two attack which are easily avoidable from the air, you can use air assault multiple times.
when the circle shows up roll over to them and remove their heart! easy
All credit goes to orginal authors at playstationtrophies.org, and this is merely updating truetrophy fans with these guides. http://www.playstationtrophies.org/game/god-of-war-ghost-of-...