well then, you sure are interested in how this works huh? let's look under the surface then.
each Alter is called a Strand, of our collective. right now you are speaking with Druvix. I'm the Strand that tends to take point in the Collective Of Mythical Stars, as I'm the most interested in our adventures. for how our being works, well, you know how space has nebulae? well, if those gases could exchange electricity, you can see how it might resemble a brain. and with enough gravity to pull them together, they would have time to mature, maybe make more gravity one day. that is precisely how our collective exists. a nebulae that had an electrically charged asteroid, with a little magical energy as well, fly through and the electricity and other energy was enough to spark a life. since then, anyone who has come into contact with that same energy from asteroids flying through, or encountering our Strands, has had a chance to merge with the collective, should they choose it. however nobody has, and we don't offer it anymore unless they are truly someone one of our Strands adores, or even multiple Strands. as for those of us already here, we were formed naturally, a few of us anyways, the rest as a result of the intense actions and occurrences that our Strands have encountered.
you may also be wondering about the whole "multiverse" thing. well, that nebula that was sparked? it was home to rifts in the multiverse, natural gravitational and spatial anomalies that let the realms bleed and drift together. all of them, in fact. it's an iconic example of coincidence, which is a motif one of our Strands loves deeply, that and chaos. put simply: we are a being of chance, our Strands examples of beautiful coincidence.