Star vs the God of Evil fanfic here:

Introduced in Chapter 9: God World of my Star vs the God of Evil fanfic story.One of the most powerful Meta Gods on New Mewni. She rides on top of Cloudy, a powerful artificial intelligence programmed into the entire Golden Butterfly City and into the flying vehicle she possesses, giving her access to a vast system of network that allows communication, data transfer, which in the end ultimately works as a planetary defense system on New Mewni. It is a powerful system that is capable of storing nigh infinite amounts of data. The Meta Gods wield powerful pan-dimensional fountain pens capable of storing 1 yottabyte of data within a single drop of ink. But Janna's Cloudy vehicle is thousands of times more powerful, and doesn't need to be recharged unlike the pens (as long as New Mewni still stands that is.)The Cloudy vehicle grants Janna a vast variety of godlike abilities. Such as massively faster than light travel, impenetrable force fields, energy blasts, hologram projections, constructs building, and of course light speed data transfer because Cloudy is one of the most powerful super computers in existence.The God of Science's cheek marks are the atomic symbols, because on New Mewni Meta Gods can choose to have cheek marks.Janna is an inventor, a scientist. She understands many things about the universe, which makes it hard to believe that this was once a young girl who was more into weird witchcraft and dark magic than anything even remotely scientific. But this is a new world, a new world replacing the old magical queens with godly science.