The Hilbert Effect is an anti-Gnosis system used to draw the Gnosis into our plane of reality, allowing us to come into contact with them, instead of them being able to interact with our plane's matter at will. Using Hilbert waves is proven to be one of the few ways to even attempt to attack a Gnosis. Once the Hilbert Effect has dissipated , any Gnosis previously effected will return to their state of invulnerability.
The Hilbert Effect is usually only operated on spacecraft, with the purpose of dragging an entire army of Gnosis out of "limbo." Using advanced amplifers, the waves can be spread over several thousands of kilometers, though no spacecraft has ever matched the incredible range of KOS-MOS, who can generate these waves from her person to at least one Astronomical Unit. The 100-Series Realians are also capable of generating these waves, but at very short ranges.
Hilbert waves can also be used to disable many high-end sensors using cross-interference. This means it also affects local systems as well. Most ships have buffering which helps to prevent this in open spaces. However, when the Hilbert Effect is used without amplifiers in enclosed spaces, all sensor systems are affected, and Ether based weaponry is rendered useless. Concentrated Hilbert waves can interfere with Realian systems as well, but it appears to have no effect on humans.