Fatefull event is good u can gt him around 8-11k based on RNG . sometime he in Mission Mobilize even its pricey u can gt alot of Freebies . and also treasure of sage around 10k-11k for 30%.

Yes. all i said above for 80 frags .

Attack -nin is what mine is at. -nin because it doesn't scale that high and only thing that benefits is his chase. His tai scaling will make up for it.

Since you have already 42 frags, you shouldn't be paying no more than 6k. If you are able to get more free frags of him, then that amount will also decrease. That's what I did with masked man and got the rest of his frags last time fate came.