So who else found all 3 Dead Ghost locations in the Reef? I just found all 3. The first is on top of Variks. If you go behind him to the left the canopy is low enough for you to jump onto. Walk to the top and the ghost is there. The second ghost is right below the entrance to the queen on the right. Walk to the steps leading to the Queens' Entrance and you will see a small platform you can jump down to. Croutch and the ghost is at the end of the platform. The third and final ghost is far right of the Trials of Osiris. Walk all the way to the wall on the right and turn right. Jump onto the small platform with the light on it and jump onto the stream pipes. Walk down to the end where to bag of junk is hanging and the third and final ghost is there.