Suffering,
and Hatred.
That's all there is to it.
Spoiler
Sasuke awakes in a body that is no longer his own; A child's body, that once used to be his. Is it real? He doesn't know. Upon meeting his parents he reaffirms his belief. After all, the dead cannot rise from their graves.
Now the question remains: Who will he punish for this actrocity? And how can he wake?
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