Everyone is associating the 6 suns as the 6 maps, but the summoning key (which is outside of the hypercube and kn-44 on the graph) has 6 symbols on it. Each showing an apothicon symbol. here is an image of each symbol and the name if anyone thinks this info is worth digging into. also, there is an image of a summoning key and you can notice the same graph like texture on the hypercube graph is on this picture of the summoning key. Perhaps being a proper way to find out what kind of graph blundell is using here and how it ties together.