"Alters local physics to augment jumping ability."
The Field Disruptor is Axiom Verge's high-jump ability, allowing Trace to leap to new heights. It gives access to new platforms and generally makes traversal easier in the game. Without it, Trace can jump on top of terrain that is 4 blocks high. With it, he can jump on top of a platform 6 blocks high.
The Field Disruptor can be found in the lower-right section of Kur. The player must drop down into a pit of sorts to get it and will not be able to jump out until the Field Disruptor is obtained, due to the height of the jump required.