There are 9 locations and four of them spawn randomly in each of your gameplay.

1st location: Arena. It’s Located behind where you guys spawn in. 2nd location: Danu Altar Room. This can be found when you look on the window which this window can be found next to a perk machine. 3rd location: Ra Tower: Burial Chamber. Look on the open walls. 4th location: Draw Bridge. Plate are in the wall of Zues. 5th Location: Temple. Go on the second level where when you come out that goes to The Pit. The plate spawn on a like a jail where you will see a lot of broken bars. 6th location: Flood Crypt. Look on the middle access where zombies spawn and you will see an open door. 7th location: The Pit. Go to where you build the shield and look on the open wall next to it. 8th location: Danu Tunnel. Look on the middle where you will see an steel door with a staircase that goes up.