1. Which Impact does Cassie Lang’s invention have?
Scott Lang’s daughter Cassie proudly presented a sensational invention in this film – and unfortunately caused all the problems involuntarily. It is a machine that can be used to peer into the quantum realm (the quantum equivalent of the Hubble telescope, so to speak).
After defeating Kang, the main characters could use his left-behind technology to perfect this invention and rebuild it into a veritable portal to the multiverse.
At the moment, Cassie’s invention only seems to grant access to the Quantum Realm, but it is quite possible that in the future, after various improvements, it will also serve as a way for the Avengers to quickly switch between the myriad universes.