Parathiritis Animadverte

The second in the Vanguard of the Abyss is Animadverte, eternally thirsty, tireless, and unstoppable, just like Perdition itself. Once he has seen or smelled the Prey, he will never rest until he has caught up with it. What dreadful fate awaits those unfortunates who fall into its cruel claws? Perhaps it is better for people of this dimension not to know of such probabilities, for the most horrible thing that man can imagine is only Hell, only an eternity of torment... Such tiny and innocent creatures as men can never realize their great Happiness of Ignorance.
The Animadvert never appears where it should not be, and its every emanation is imbued with the heavy tread of doom. He delves into certain worlds, and before devouring them, he nurtures his "flock". The harvest is prepared for long epochs, and no one knows for Whom. Only just before the end does Parathyritis show its face to another world, proclaiming its invasion, and promptly begins the Harvest.
He wields a weapon akin to a hilt, scythe, and spear, and his unrelenting blows fall on men and gods alike, and according to one of the Forbidden Legends, he will one day reap even Death. He also wields a monstrous and ghastly Book that carries unprecedented cruelty and knowledge of it into Creation, and even the eyes of the gods burn at the sight of it.
All of Animadverthe's attributes are exquisite traps from which there is no escape. Those who have touched his image, even with a mere thought, call upon him. Those who have learned of him begin to exude an ineffable fragrance that he will be felt even through billions of universes. Those who have seen him have condemned their world to a fate so terrible that no one dares to speak of it - no one and never, in the infinite spectrum of manifested worlds.