Reality god is the mysterious being responsible for the creation of all realities and existences and he has absolute power over everything and everyone with no exeptions..he is also a fully neutral being since he never interfere activly with any event..but he is very curious to see how a being may react to having the full capacity of his powers..so all he wish doing for now is finaly just having some fun throught a single test..even why he never take a break off from guarding all realities and existences..and what that test may be?..he will take you..whatever being you may be..and fuse himself with you..granting you the ability to do anything at any scale place time and size..