Jak II

The Metal Head Skull Gems are the shiny yellow gems that are located on the forehead of Metal Heads. To obtain one, you must kill the Metal Head carrying it by using your guns or your melee attacks. Upon killing the Metal Head, the Gem will bounce around the area and eventually settle until you pick it up.

If you kill all the Metal Heads you encounter, you will almost certainly obtain this trophy by the end of the game. Each unique Metal Head you come across only carries one Gem, so if you kill a large group, obtain their Skull Gems and then die, upon restarting the checkpoint they will no longer have a Gem on their head. However, if you kill a Metal Head but don’t get a chance to collect it before you die, that same Metal Head will have a Skull Gem again when you respawn.

Metal Head Skull Gems are used to buy Dark Jak powers from the Oracle. All the powers cost a total of 525, but only 510 are required for the trophy. The total of 510 is cumulative, so if you buy powers you won’t need 510 in your inventory for the trophy to unlock.

If you come to the end of the game and haven’t got 510 Gems, do not worry as once you complete the game every Metal Head you come across will have Skull Gems again. A particularly good post-game location to farm these if necessary is the Mountain Temple, as that is one of the few areas where lots of Baby Metal Heads (the easiest Metal Heads to kill) still spawn.