Ireul

Nothing about Ireul is visible to the naked eye. The Angel consists of nano scale organisms comparable to a virus, and it claims territory by multiplying at the cellular level rather than moving as a single body. Whether any core exists within it is never established, a question its sub-microscopic size may render moot. On screen its presence registers first as spreading discoloration and later as a growth patterned like electronic circuitry. Its name, rendered in Hebrew and sometimes written Iruel, translates as Terror of God.

Adaptation is Ireul's true weapon. Confronted with laser fire, it raises an A.T. Field to swat the beams aside; drowned in ozone, it needs mere seconds to adjust, then consumes the gas as fuel and grows stronger. Its evolution eventually carries it beyond biology altogether, letting it interface with machines, crack the MAGI's electronic defenses, and shield the physical cables it rides behind an A.T. Field so the connection cannot simply be severed.

Episode 13 stages the Angel's emergence inside the Pribnow Box, far below ground in the GeoFront, where staff mistake the early growth for corrosion until it creeps toward the pilots undergoing tests. Before understanding their enemy, Ritsuko Akagi and Misato Katsuragi order lasers against the infestation, an attempt that dies against a materialized A.T. Field. Discovering a weakness to ozone, they flood the infected area with it, but the reprieve lasts seconds; the Angel absorbs the gas, mutates into its circuit-like configuration, and penetrates the MAGI system, reading critical files and working to trigger a self-destruct sequence. Ritsuko slows the intrusion just long enough to reach the last uncompromised MAGI unit, through which she steers Ireul's own evolution onto a course ending in its self annihilation. Sahaquiel precedes it in the order of Angels and Leliel follows it. The Book of Enoch, an apocryphal Old Testament text, names Ireul the Angel of Terror.