This week I sweep upgrade material and awakening material
Next week I'll sweep all ninjas. Ultimate goal is make all sweepable ninjas to 5 stars and prepare for the ninja star system. Also the reward from refine fragment will change overtime. Now it maybe Iruka but later will be someone else according to CN version and even more rewards, not just seal and summon scrolls.
Also ninja like Neji who is better than his GNW version with skillbook upgrade will require a huge amount of fragments. 100-150 frags for 1 skill upgrade if I'm not mistaken.