i dont have iruka frag in arena shop, any other tips?

He's saying to get frags of other ninjas from the shops, and if they are 5* ninjas, these additional frags you just bought can be converted in your ninja refinement over time to gradually exchange for Iruka frags.

Don't see where the risk is.

No, he means use the refine thing in ninja tab to convert excess ninja frags into ninja refine pts, which you can exchange 3k of to get 10 iruka frag.
The thing is, each ninja frag is worth at most 10 refine pts (depend on the ninjas), so the best deal you can have is spend 500 exchange pts(of whatever type) to get 50 refine pts, so it cost 30k total exchange pts to just get 10 iruka frags.
Considering my current balance total stands at around 200k, that's only 70 frags or so. Granted, I have already exchanged a number of the pts for iruka this way, half way to 4 star now. In any case, while it might be possible to get you to 4 star reasonably quickly, it's quite the useless idea for 5 star.
Of course, you supplement this by using elite instance to farm for excess ninja frag(instead of staring up ur other ninjas and/or farming plots for material), thou if you spend 300 stamina a day that way, you will get maybe 200 pts, ergo 2 weeks for 10 frags. It would take half a year of both dumping shop and using most stamina on this farming to get iruka to 5 star.

The only 2 ninjas i spam the most are Kabuto and Lee from survival, they are both 10 points, 20 frags per day and that's minimum 200 points (as if you got them twice daily), excluding other random you might get each day.

I'm not spending my arena coins. It's so hard to get, cos i hardly have a match. :L Saving it for next shop updates, only god knows when. :sleepy: