Primordial

When Entitykind wants to understand more about their multiverse, they evolve into the Primordial. A species that firstly understands and sees different dimensions work but can't travel to them[6] They can see themselves alternate dimensions, even negative-dimensional space. String theory has been validated and used very well. They can also see the timeline of their multiverse but they can't see its future. The ascension from Entity to Primordial leads to their civilization reach to Type VI on the Kardashev scale. With this ascension, they have fully conquered the multiverse.