Origin

The Fallen One's original state is unknown. Eons ago, Galactus granted the Fallen One power in his first attempt at creating a Herald. Unlike the other later Heralds, the Fallen One was empowered by dark energy instead of the Power Cosmic. The Fallen seems to hail from a humanoid race of similar proportions to the Silver Surfer in stature, with skin colored black or very dark blue, and a long mane of hair.

Activities

Eventually Galactus became tired of the Fallen One's madness and cruelty and had placed him in a prison. The Fallen One eventually escaped his prison and immediately attacked Galactus, who defeated The Fallen One and imprisoned him again. Due to the endless source of energy provided to him by Galactus, the Fallen One was doomed to eventually escape his prison and in anger, seek revenge again. After countless defeats, the Fallen One was defeated by Starlord at a great cost of life. He was then imprisoned in the Kyln, a super prison at the edge of the Marvel universe, a place known as The Crunch.

The Fallen One is Freed

When Thanos warred with the Maker at the Kyln, the destruction freed the Fallen One, who set out again to attack Galactus. Thanos then defeated the Fallen One by hitting him with some sort of a cosmic lobotomy that made him his Herald.

Annihilation

During Annihilation, the Fallen One was defeated and captured by Tenebrous and Aegis. Later on, Thanos traveled to reclaim his lost Herald and was presented with the husk of the Fallen One by Tenebrous and Aegis.

Powers

The Original Herald

Fallen One possesses cosmic powers different from any of the other Heralds of Galactus. Unlike Galactus' other heralds, Fallen One's infinite power source is black matter. The Fallen One manipulates this infinite source of cosmic energy for applications such as incalculable strength and durability augmentation. The Fallen One can navigate space, hyperspace, dimensional barriers, and can achieve flight of near-limitless speeds by entering hyperspace when he exceeds light speed.

The Fallen One does not require sustenance or rest as he is sustained entirely by the conversion of matter into energy. He is not affected by temperature extremes and most forms of radiation and can survive unaided in vacuum environments such as outer-space and hyperspace. He can analyze and manipulate matter and energy, and can reconstruct or animate matter at will, even transmuting elements. He can heal living beings (but cannot revive the dead), and like Galactus' later Heralds is capable of revitalizing or evolving organic life on a planet wide scale. He can change the size of himself or of other matter, create illusions, fire energy projectiles, form and manipulate energy constructs, manipulate gravity, absorb and discharge almost all forms of energy, and can phase through solid matter. His senses allow him to detect objects and energies light years away, and to interpret matter and energy on a subatomic detail; he can even see through time, and with concentration can achieve limited perception of historical and future events in his general vicinity. Also, like other Heralds of Galactus, The Fallen One has limited telepathic abilities.