so, after finding the last part for bhakti (was not expecting that vampire to have it ) and actually buying a trapezohedron, i went through chapter 12 with little to no effort, only losing to a pair of humbabas and the absolute worst luck i've ever experienced with a sacrifice. now i just need to start going for 5 more traps and the hardest part is over.
so i've beaten barthandelus and backtracked to complete as many cie'th stone missions as possible. slightly over halfway there, and i have the vast majority of that half 5-stared. wish i could find the last part for bhakti though.
i'm not gonna start chapter 12 until i get lightning's t3 weapon, just for s and giggles.