If you put me in the game I am a time-traveling assassin who comes from an alternate future where Mytoss was assassinated before he could complete his mission. This resulted in a chain of events that led to the downfall of modern civilization as America became more and more corrupt and began experimenting with more brutal forms of control over the population.
Grave travels back in time to the present where the game takes place, his mission to seek out Mytoss and prevent his assassination. The kicker? HE was the one who was ordered to assassinate Mytoss to begin with.
To prevent the future, he must be willing to defeat himself, and possibly erase his own existence.
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