What's a 'Cue Eye Pee'?
The Quantum Identity Pattern, or QIP, is a unique quantum energy signature inherent in every sentient being. This pattern houses one's memories and personality, and is what allows one to persist even as the cells in their body die and are replaced. In this way it also occupies the same conceptual space as the "soul". TEL describes the QIP as "similar to, but completely separate from, a person's physical DNA".[1]
Description
I'm gonna live forever, Uri boy.
As the QIP is deeply intertwined with one's physical DNA, it can be modified to change the bodily functions and appearance of its owner. The QIP "manifests" an individual's parentage. This is what allowed the QIP of Archarin, as the son of Ausar, to activate the Infinity Blade.[1] This is also the reason why the QIP of a Deathless' progeny poses a potential threat in the hands of one of their enemies.[2] QIP cannot travel through vacuum.[3] This is why the Worker had to travel to the Moon via the Ark.
One of the most common functional changes seen in the series is that which makes one Deathless; allowing their QIP to persist after bodily death and seek out a new body. Evidently, the process to make someone deathless also includes changes to protect the mind "from the weathering of the ages."[4]
Changes in appearance are also common and can be as simple as an increase in height to something as drastic as an apparent change in species. For example, Gortoel makes an appearance in Infinity Blade: Redemption some 10,000 years before the first Infinity Blade game but in the form of a human. This stands in direct contrast with his brutish appearance in Infinity Blade I, implying that QIP alteration had taken place. This was later confirmed by Donald Mustard during a podcast who stated that Gortoel chose to take on this form.[3]
In Infinity Blade II it is revealed that the Worker of Secrets knows how to destabilize the QIP of a Deathless, granting them "a true death". The Infinity Blade works by killing the Deathless' body, ejecting their QIP therefrom to be destabilized by the QIP destabilization ring in the blade and ultimately destroyed. This is shown in Infinity Blade III when the Worker impales Raidriar with the activated Infinity Blade, causing yellow, orange, and blue streaks come out of the wound; assumed to be components of Raidriar's destabilized QIP. In contrast, the effect of QIP destabilization without bodily death is shown when the Worker destabilizes Thane's QIP, causing him to writhe on the ground. As Thane was never properly killed his QIP was destabilized and became corrupted, turning him into a QIP abomination.