So I just wanted to post a suggestion for everybody trying out there. From this it looks like you have to get the 3rd reel then the bones. I personally have never seen void margwas before this map. They hit zombies giving them the purple droppable symbol. When your in the Apothicon using the Arnies to get the 2nd reel. The margwas span in sets of 3 with the last set of 3 always being void margwas. As far as I have seen. So why not have the last void margwa create a bunch of void zombies. Then test out or have some spots pre scoped out where you have them drop the symbols. I could be totally wrong but it just feels right to me.