Name: Valentus Undying
Species: Animated Armour
Age: 974
Appearance:
[img]http://fc04.deviantart.net/fs71/f/2010/077/0/6/Grey_Knight_alt_pose_by_TerronViking.jpg[/img]
Abilities:
[Construct]
Valentus is an undying animated object, a suit of Power Armour given life. He feels no pain, has no blood, and does not require any of the things living beings need (like eating or sleeping). Any attack that targets the organic body is useless against him, as is any attack that alters brain chemistry. He has no vital organs, and as such almost any physical attack is useless against him. The only way to kill him, physically, is to destroy the Animation Sigil on the inside of his suit.

[Psionic Capabilities]
The original Valentus had immense psionic powers, exceptional even among the ranks of the Paladins. His ability was on par of some of the greater Librarians, and his weaponry retained the mark of his mind. Whether it is this mark, or it's birth within a Warp Storm that granted Valentus Reborn psionic capabilities is unknowable, but he has inherited powerful psionic abilities. He is not as powerful as his predecessor, but his lack of an organic body allows him to bypass the perils of the warp. He can continue to use his powers indefinitely, with no penalty.

[Absolute Purity]
Valentus Reborn exists as a reflection of the original Valentus. His mind cannot be altered, controlled, or in any other way affected. He is completely immune to the seductions of Chaos, and most psychics would see him as an unmoving white blot. However, he is incapable of wielding the Words of Banishment due to his 'broken' soul, and his mind is nigh-impossible to change.
Weaknesses: 
He is really, really heavy. Like, put him on the second story, and he'll sink straight through the floor. He can't use stairs because his footsteps would destroy them. He also can't use his psychic abilities if he's cut off from the Chaos Realm (the Warp). Lastly, he's really shit at subtlety. But who needs subtlety when you're a psychic tank on legs?
Bio:
Valentus serves under the Grey Knight, the hidden military arm of the Ordo Malleus, the Inquisition. He spent nearly a thousand years fighting the forces of chaos, and he proved his worth in every crusade. He earned the rank of Brother Captain of the First Regiment after he saved the life of a Grandmaster. Wishing to reach the pinnacle of his potential within the ranks, the ambitious Grey Knight aspired to become a Paladin, the elite warriors of the Chapter. He would serve directly under the Supreme Grandmaster, and would act as his personal bodyguard. And as his desire and potential were recognized, he was awarded the right to go on the eight quests. He completed each, finally slaying the Witcher Lord singlehandedly. He was awarded the right to become a Paladin. And while he was not immediately awarded the position of guarding the Supreme Grandmaster, he knew he would reach his dream.

However, it was not to be. On his first mission as a Paladin, the battlefleet he served on was hit by a Warp Storm. The forces of Chaos washed aboard in waves, even as the ships were pulled into the Warp. The fleet was stranded, cut off from help and surrounded by infinite hordes of demons. For nearly 200 years the Shield of Man held strong, firing until no ammo was left, striking until they had dulled their blades on the enemy's bones, and then simply pummeling their enemies to death. But they were outnumbered infinitely, and those horrors they killed reformed from the energies of the Warp. Those who did not fall to the infinite enemy hordes were slaughtered in the great Storms and Winds of Chaos that swept the realm. In the end, with nearly a thousand battle brothers dead around him, only Valentus remained standing. On top of a mound of corpses the size of a mountain he fought, tireless, fearless. But even he was doomed to fail against the unending enemy.

By some scheme of fate, however, he was saved. In a momentary break in the enemy assault he stooped, retrieving the weapons of his allies as he prepared to once more face the enemy. He stood ready to die, determined to face the Dark Gods one last time. But even as he prepared for the end, his story truly began. For in that moment his latent abilities awoke, and right before he was crushed by the incoming Daemon, he was transported to the realm of Tor-6. There, he would continue spreading the name of the God Emperor, and he would crush the enemies of mankind. With the fate of his brothers in mind, he set out to make the most of this second chance at life.
Theme Song: We are the SPACE MARINES! We are the SPACE MARINES! Our enemies DIIIIIIIIIIIIIIEEEEEEEEEEEEEEEEEE