system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] How powerful can Galactus be.

I have been getting into comics more and Galactus seems to be a cool character and want to know just how powerful can he be. I see the name Black celestial arc Galactus thrown around as being possibly a multiversal threat. I would like to know more about this character.
gpt
Well for starters:

> The first (and oldest) living entity in the universe, Galactus employs advanced science capable of creating the Ultimate Nullifier (capable of destroying and remaking the multiverse) and the ship Taa II. Reed Richards speculated that Taa II (the Möbius strip-shaped, solar system-sized home of Galactus) might be the greatest source of energy in the universe.