How do i push towards 4 star?

[Mishini_Dracoto]

and let's not forget about the Master 2 books. I think skill is actually going to be the biggest barrier to 4-star for a lot of the new 3* crafters.

I agree x10. I only have 1 Supra, and I only have 4 crafts capable of 4* due to those master 2 books. RNG Fails me every time, I've desynthed 20+ Mastercraft Demimateria in one sitting and have gotten 0 mastercraft Demimateria from it. SE & RNG hate me.

As for your brother, if you have 350ish crafts & Control, and 355 CP without food, you can guarantee any 2* Synth at 100%. The rotations are already in these Forums ^^