Diabolist

Meet the most stereotypically evil-looking guys in the Heresy. And you thought Skeletor was too overtly evil.

Diabolists were a type of warrior employed by the Word Bearers during the Horus Heresy and were effectively the precursor to the modern day Chaos Sorcerer and Dark Apostle.

Overview

First appearing openly at the Battle of Calth, these proto-Sorcerers specialized in Daemomancy and using the powers of the Warp in battle. One of Roboute Guilliman's edicts after Calth was the specific targeting of these officers.

Interesting enough, the term, "Diabolist", was first coined by the few survivors of the 22nd Chapter of the Ultramarines Legion during the Battle of Calth in 007.M31, NOT the Word Bearers themselves, although they later co-opt the name as the Heresy escalated.

Another 'funny' thing that thing that occurred was when the Ultramarines, before the Word Bearers revealed their Heresy, fought alongside their 'brothers' in spring cleaning the local Ork infection, there was most likely Diabolists intermingling with their Ultramarine cousins. We mean, just look at that armour and tell us how the proverbial fuck the Blueberries missed the mother of all redflags. Seriously, that armour just screams EVUL.

In terms of equipment, these guys wore what some believe to be the very first rendition of Sorcerer's Power Armour as well as a Force Staff.