Detailed Information of Superhero
Abraxas is very Powerful but was killed by Reed. When the Galactus of the prime reality died, Abraxas emerged. Abraxas soon began to cut a swath of terror through various alternate realities, including the murder of other versions of Galactus.
Abraxas used the head of a Galactus to target and home in on the prime reality's Earth and to plant a mole in the form of an alternate universe version of the dead Herald Nova. On Earth, Abraxas attacked Uatu the Watcher and stole half of his signature medallion.
Fantastic Four (Vol. 3) #49 (November, 2001)