The tenth dead apostle is a mass of chaotic matter similar to primordial soup, resulting from the accumulation of 666 creatures' lives. nero, phonetically spelled "nero", was named after him by the church as a play on words in gematria that adds up to 666, the number of the beast. originally an alchemist named fabro rowan from the sea of estray, this cluster of smaller sorcerer organizations in northern europe. to achieve immortality, he developed a method by which to merge his existence with other creatures' lives, resulting in his transformation into chaos. as a sole accumulation of lives with collective consciousness but not entirely under his control, nero was beyond his own understanding. despite being aware that his mind was fading due to the union with beasts, his ultimate goal was to comprehend the chaos that formed him.