Embodied by the First Firmament, the First Cosmos was the very first universe to ever exist. During the Celestial War, the Celestials detonated their unimaginable weapons against the Aspirants, shattering the First Firmament into pieces. The hundreds of new universes born from those pieces coalesced into the first Multiverse and its personification.
According to an alternate Loki with all the Infinity Stones, "the original universe" can be accessed by breaching the bottom of the Quarry of Creation, but all the stones are needed to do so. The prime Loki, after collecting all the stones, entered the alleged original universe and found out that it is full of Infinity Stones and Celestials.
- Two other different accounts as to how the First Cosmos was split into the Multiverse were presented throughout the years:
- Nemesis, the only living thing that existed within any and all realities, chose to put an end to itself because of its loneliness. From its ashes rose the Multiverse as well as the six Infinity Gems, the reincarnated form of the being's might.
- The Celestials, wanting symmetry, created the Exterminators to be the death to the life they made from the darkness. When their creations turned against them, the Celestials split the universe into the Multiverse and sealed the Exterminators into one of those universes.
- 4 appearance(s) of First Cosmos
- 5 minor appearance(s) of First Cosmos
- 6 mentions of First Cosmos
- 2 image(s) of First Cosmos
- 2 characters that originate from First Cosmos
- 3 races that originate from First Cosmos