Tachyon Wave

Under certain ultra-high-energy conditions, the quantum field of spacetime can be temporarily "flipped" into a seemingly impossible formation with imaginary mass, called a tachyonic field. This short-lived state spontaneously condenses into bosons with a reversed quantum ground state, called tachyons. When Omega-Class Entities make full contact with Avatars in lower-dimensional spacetime, it results in spontaneous, continuous tachyon wave production. This lead to the condition known as Omega Mode, and it is only possible for an Omega to maintain such contact without destroying the fabric of reality by "riding" the tachyon wave backwards through time. As such, Omegas perceive their contact with lower-dimensional spacetime as occurring in reverse, i.e. traveling from future to past.

Trivia

 * Tachyonic Fields are a real-life phenomenon produced in the Large Hadron Collider, but the resulting particles are Higgs Bosons, not tachyons. Time-reversed tachyons were a mistaken conclusion drawn from a phenomenon which, until the LHC was built, could only be postulated mathematically.