Once a Wizard of the Empire, Altero's studies brought him to
recklessly peruse the forbidden tomes of Tzeentchian lore. He
gained much in skill and power from the spells of the Trickster God,
but his mind and body were both twisted beyond recognition. Now,
he travels the Old World on missions that he sees in Visions - he
claims they are the sacred commands of Tzeentch, but they may be the
fevered delusions of a broken mind - certainly, noone has yet been able
to determine a pattern or rhyme to his acts.
He is constantly accompanied by a familiar, a Horror that preferably
takes the shape of a snake, with a varying number of screaming faces.
Whereever Altero goes, he attracts those spellcasters and
charmweavers that are weak in sorcery but big in aspiration - he fans
their ambitions, and promises them that they can partake of a greater
magic. Those who accepts his deceitful words are
transformed into Horrors of Tzeentch, where their magic ability is
truly greater than it was before, but where their souls are forever
lost.
Hundreds of years ago, a lesser noble in the Empire made a terrible bargain with the Dark Powers, wishing for Life Immortal and Enough Power in his Little Finger to Slay an Armoured Knight. Nurgle, whose emissary the noble was bargaining with, was much amused, and granted both wishes, in return for hosting the Chaos God's Favorites within the noble's mortal shell - and he was transformed into The Blessed, host of Nurgles Favorites.
Now, every disease known to man (and a few yet undiscovered) wracks
his undying body, making his life en eternity of torment. He has
grown to giant stature, and his body reknits itself when struck by
sword or arrow. His little finger has, in accordance with his wish,
grown to a huge, filth-encrusted talon. If the strength of his
blows does not fell his foe, odds are that the enemy will succumb to
the poison carried by the smallest scratch of that finger.
Maddened by pain, The Blessed wandered the old world, seeking any
foe that could kill him and end his misery - but even when completely
destroyed, his body eventually reforms, bringing him back to its
unending suffering. Some years ago, The Blessed encountered
Altero, who convinced him that he could lift the curse and end the
torment - if only The Blessed would assist him for a few years.
The years goes by, and Altero has yet to produce a cure - but The
Blessed still hopes, and still follows the herald whereever his dark
purposes take him.
When Altero leads his minions to war, the scent of coming battle allows the servants of Khorne to pass from the Chaos domain to the site of impending deaths - thus, his in battle his warband is accompanied by a company of Bloodletters, the Red Blades.