Naruto: The forgotten Senju's

Sukuna Senju strives to lead the Senju's back to their peak, no matter the cost. After Tsunade's departure, the Senju's had no qualified heir for their clan. Their last Elder was on death's door and only dozens of people were left. The clan was doomed to lose the battle of time, or so they thought. ---------- Cover was found online, I couldn't find the original author so if you know please tell me so I can give credit where it's due