The One is extremely strange
Like I've mentioned before, there are one or two origins specifically saying The One didn't make the multiverse, The One was just...there, and it made Unicron to explore it, except Unicron decided to eat it all instead.
Trying to patch together all the various origins you get something like this:
The One "encounters" reality, makes a race of all powerful god-beings. One of them, Unicron, eats his siblings, and the old reality, then goes to sleep. Tiny bits survive and create a new reality and Primus with it/Primus is born by being cut from Unicron and the new reality comes into being as a side-effect. Unicron awakens confused that things still exist and starts destroying it again, Primus tries to stop him and is losing. Tricks Unicron into becoming trapped into a physical form along with himself.
TF is deliberately obtuse about how the multiverse started, Furman himself has written I think 3 or 4 different origins that all both line up and conflict in some ways. It's pretty cool, but also hard to parse with regard to this hobby.
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