There was a saying in psychoanalysis: "When choosing a mate, the template we seek is a substitute for some ideal version of ourselves that we have failed to attain." Fulgrim and Ferrus each saw in the other the perfection they wished to pursue. Their close relationship was therefore not difficult to understand.
Ferrus gave Fulgrim a golden sword, while Fulgrim gave Ferrus a heavy warhammer. Fulgrim praised the blade forged by Ferrus, saying that only the fire sword wielded by Nuada in Celtic mythology could compare to it. Ferrus praised the warhammer forged by Fulgrim, saying that only Thor, the god of thunder, was worthy to wield it. The two smiled at each other amid their mutual praise, gifting their forged weapons to one another as tokens of enduring friendship.
Still, Ferrus had some objections to Fulgrim's pursuits. He always felt that filling warships and fortresses with marble statues and exquisite paintings was making a mountain out of a molehill. Fulgrim merely smiled and mocked Ferrus for being like an evil Medusa, with nothing but fighting and killing in his head.
Ferrus gave a forceful response to Fulgrim's teasing as well. "I'm going to beat you up here, in front of everyone." Faced with that blunt, barbed threat, Fulgrim only smiled. Their frictions seemed entirely without malice, like friends ribbing one another; being overly polite would have made them seem distant instead.
But Fulgrim was sensitive, and narcissistic. His perfection could not tolerate anyone's insult or desecration. Even if he showed no hostility on the surface, deep within his heart, at the bottom of an unconscious ocean of emotion, there burned a flame of indignation fierce enough to consume everything.
The Imperium's fragmented and incomplete historical records stated that Fulgrim had fallen because of Slaanesh's temptation. Those Inquisitors with the