"Remember that the Spirit Bomb is a martial arts discipline that allows you to borrow energy from grass and trees, from people and animals, from inanimate objects and the atmosphere... And then to concentrate them and release them. If you can draw so much destructive power from a ball made on this small planet... ...Imagine what you can do with a Spirit Bomb formed on Earth! If you can also learn to tap into the astounding powers of the Sun... Well. Just be careful. Or you may destroy the very planet you're trying to protect!" --King Kai in Chapter 212 of Dragon Ball
It's kind of vague, but everything has ki, more or less. If Zamasu, who has evil godly ki, started to become one with the multiverse, the entire multiverse would start to feel like Zamasu's evil ki.
...That said, *did* Infinite Zamasu truly become 2-C before Shin left? I don't think so.