Floor 1659
This floor is a structural collage of a library, meat processing facility, and military starbase.
In this floor, an anomalous series of concentrated gamma radiation hits a stockpile of raw leather in the meat processing section of Floor 1659. The subsequent piles of leather are violently shredded and nearly atomized, but the unusual amount of photonic energy from the gamma ray blast mysteriously reconstitutes those destroyed piles of leather into whole pieces again.
Immediately afterward, another anomalous effect from the blast takes hold; the piles of leather spontaneously gain life and begin a process of rapid structurization toward forming a humanoid form. When that process subsequently finalized, the pieces of leather gained a sudden collective-wide sapience.
The humanoid leather lifeforms all have an innate superpower of either being able to manipulate or expel photonic energy, in the form of either wave-like beams or direct bolts. Along with that, they were immune to all forms of harmful ionic radiation
In the beginning, the leather lifeforms; deeming to call themselves the Leathericonians; were all divided into warring tribes. The conflict between these Leathericonian tribes lasted for decades, until one unifying event took place.
During a routine skirmish between the warriors of the Ha'zlak tribe and Vakdocian tribe in the library region of Floor 1659, attending shamans who peacefully oversee all combat between the Leathericon tribes, were at the sidelines of the skirmish. By a stroke of freak chance, one of the shamans takes out and begins reading a textbook on butchering techniques.
What he saw in the textbook, horrified him.
All manner of atrocities were being enacted on other lifeforms the Leathericons had never seen before. Those atrocities depicted in the book was being done by another species of lifeforms. They were furless, but had hair, and had smooth skin; with that in particular being semi-anathema to the Leathericons; and a penchant for abusing lifeforms less naturally intelligent themselves.
Leathericon-wide society, irregardless of tribe affiliation, were repulsed by the actions of those mysterious lifeforms, who the leaders of Leathericon soon discovered were so-called "humans".
With their natural photonic energy emission and access to high technological building materials, the Leathericons constructed a massive stationary warp gate from spare parts. From Floor 1659, Leathericons through the use of their warp gate, raided and neutralized many different human groups on many different floors of the Bay12 Skyscraper.