Naruto: Konoha's Rogue Ninja Gets Stronger with Every Kill

[Naruto fan fiction] + [A System that Makes You Stronger by Killing Enemies] + [Naruto's Descent into Darkness]

When Naruto wakes from his coma, he is met not by Konoha's rescuers, but by Root assassins. He never imagined Konoha would try to kill him.

Then he'll kill them! He'll wipe out everyone who poses a threat to him!

A contest of influence? Naruto will build an army of rogue ninja himself. What faction could possibly be stronger than his?