Fics like Terminal Velocity

(Second in the series! Sequel to Perihelion) Diving out of the path of death in his own universe, through a tear in reality that dumped him into an equally dire situation, Isaac Clarke found himself fighting Knights of Hell, mutated by second generation necromorphs, alongside the Doom Slayer, and his patient AI companion, VEGA. Miraculously surviving and ending the onslaught of invading and infected enemies from hell and nightmares alike, the trip discovered they had only begun to stop a much bigger event. Convergence is being started by a wayward human, on a scale hitherto unseen by even Isaac himself, and only he and the Slayer know about it. Can Isaac's decaying brain, marker growing inside, stay together long enough to save a universe that isn't his own? Will he survive only to die from the side effects of his exposure to the first marker, or can Vega and the Slayer help him stop convergence, and stop Isaac's body from killing him?

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