Pherdanta's view of Ferex was different to that of everyone here.
The Apostle was covered in silvery scales, like some kind of living armour. His head, which essentially looked like a wolf-themed helmet – fierce and life-like – gave a very different impression of what Ferex was like as a Null Lifeform. He was fierce, but very self-conscious. Especially after the incident.
A rough, brown hide wrapped around Ferex's shoulders like a cape. It was a mutation called the Pseudo Spirit Walker's Hide, a type of apparel imbued with the qualities of the Null Life Class called Spirit Walker. Essentially, when used, it made Ferex invisible to most sensory abilities.
Before, Ferex had been the Limitless Body Null Demon Hound, a species of Null Lifeform that could mould parts of its body into varying types of materials. It was similar to Grim's Paradon Parody, only, it could also manifest materials exclusive to the Null Verse.