Fuegan - The Burning  Lance

Of course we all know Fuegan on one Aspect. He's the Phoenix Lord and founder of the Fire Dragon Aspect Shrine.

Like all the Phoenix Lords, Fuegan was trained under he vigilant eyes of Asurmen in the arts of combat. All the Phoenix Lords developed their own unique style of combat, where  Fuegan's was the utter destruction of their target to ensure that they stay dead and bring the galaxy a step closer to peace and harmony.

Prophecy and History.

When you mention Fuegan in the Eldar Circles, they'll most likely depict him as the one who holds the cosmic serpents of entropy and wisdom in both of his hands.

It's like he's depicted as a greater demigod as the others, when you hear him set a whole world ablaze with but a mere footstep, his eyes bring about the fiery destruction of his enemies and there's nothing but smoke around him, when people, human or not, earns his wrath. He's also the one who's fully obsessed at a higher rate than all the other Phoenix Lords combined. He's fully synonymous with his Path of War and he's quick on the trigger when an enemy shows. Nothing will stand in his way

Such is the depiction of Fuegan's History. During the end of his training and the building of his shrine, he disappeared and no one knew where he went. People were worried but suddently, during an important battle that took place on the planet Haranshemash "The World Of Blood And Tears", he appeared with a group of Fire Dragons, helping the Eldar by fighting side by side with them.

Next time he was sighted, was on Medusa V. There he led another group of Fire Dragons and assaulted an Imperial Fuel Deposit. I have no idea why, but apparently, it was important to some kind of prophecy.

Ahriman.

Ahriman is one of the greatest sorcerers still alive in this universe. He's the one who's responsible for the creation of the Rubric Marines by conducting the Rubric of Ahriman to save them from the rapid mutations that had sent almost the entire Legion to its knees. Of course, the Legionnaires were saved, but without magic in their blood, they were transformed into shells, a living armor. The sorcerers, however, were made even stronger and more powerful. Ahrimans own powers were augmented so much that he became the strongest sorcerer next to Magnus the Red, the Primarch of the Thousand Sons.

Because he conducted the Rubric, Magnus banished him from the Legion, making him a wanderer across the galaxy where he gathers further knowledge to reveal some of the greatest mysteries ever - To see if he can finally grasp the nature of Tzeentch himself, something that's impossible because  Tzeentch's nature is unreliable and random at best.