Compressing its identity with the most superlative tripe, Nal is a supersentient waveform of immense psionic sophistication given to the ephemeral manipulation of particles to a remembered form. We have ENDER, the demiurge of this particular genesis, to thank for the anomaly.
BACKGROUND
Every civilization evidently comes to an end. After all, cultures are composed of mortals, and mortals are, de facto, temporal. While a select band may argue that point, they are arrogant fools, and not to be trusted. That said, such an array of mortals had attained a level of immense technological insight, and from their intellect blossomed a galaxy-spanning sphere of habitable planes, called sabots, each the size of a large planet and interconnected by Einstein-Rosen bridges. They eventually wove a series of vorpal helices around the unstable quantum bridges, and later completed the tapestry of the hollow sphere's surface by overlaying it with a biological amalgam that eventually manifested as an enormous landscape.
The capabilities of ambition are far-reaching.
Of course, while space may seem infinite, resources generally are not, and the expansion of one civilization means the ravaging of another. Were the one in question allowed to grow unchecked, it would have been the bane of many a galaxy and the destruction of many an amoebic ecosystem. Indeed, it was to begin with, as the architecture of its growth tampered with the natural order of evolution in the cosmos. Were that not so, fate may very well have moved otherwise.
ENDER, the actuator of this civilization's fate, saw to its termination, and the largest object known in the universe to that time was suddenly and instantly snuffed out: compressed into a singularity by an omnidirectional black hole that had manifested directly in the midst of the enormous sphere. The threat of that active galactic nuclei had gone unnoticed - granted, short notice was given - and, when gravity reached a tipping point, the intricate lattices of that world crumbled. The onrush of matter that filled the void created by such an expansive object's disappearance did, in turn, smother the black hole. To the naked eye, nothing to speak of remained. Yet the product of this macro-quantum collapse was Nal, who, in true sang-froid fashion befitting its people, survived the greatest calamity of mortals in recent history, albeit in the frigid vacuum of space in a form more quanta than materia.
Yet in this quanta was the set of knowledge and emotion that had been trillions of embodied souls just hours before, and, after many a millennia haplessly adrift the emptiness of the multiverse, it swiftly developed a keen sense of irony and certainly a tinge of bitterness. Such emotions sculpted its personality, and, when it finally coalesced around a planet where other mortals lived out their lives, it carried on the great tradition of its maker.
APPLICATION
A sine qua non, Nal's atrocities and self-perceived evils often serve a purpose beyond what it realizes. If that were not the case, it would not be permitted to exist. The epistemology for this is not necessarily divine, if such a thing as divinity exists, but merely an extension of natural law. Nature is brimming with similar agents manufactured for the purpose of curbing the rate of its expansion, ensuring the balance of entropy and syntropy, and has mechanisms to ensure they do not exceed their created purpose.
One such thorn in the flesh, as it may be called, it Nal's inability to maintain form for an extended period of time. The particles it uses to manifest as are not in resonance with the ideas that compose its identity, and it eventually - if given to exertion - dissipates, and must meditate and refocus itself to mold anew.
PERSONALITY
Given the mise en scène, it is easy to come to the conclusion that Nal is a rather angry, bitter entity. After all, its whole universe was extinguished without any warning or opportunity for absolution. Its physicality shredded and fused with countless other souls, and transformed into more idea than physical manifestation. The worst part is, it cannot play with itself anymore. So it plays with others, and not in a good way. It actively seeks to torment its victims, aggressing them with irrationality, scorn, and hate by transforming itself into an unparalleled effigy of their dread.