Title explains itself. I say in NG+ because Arena season 2 is a hell of a lot harder in Season 2 (the Muruk takes too long to kill, it's ridiculous), making it take quite awhile to farm. I recall getting maybe four on my first playthrough just playing the game but is there any better place to farm them?
Arganan Temple can score you three each round. Just make sure to go to menu and leave dungeon, that way you don't need to kill the boss :P --- The Last Story. Xenoblade. Girls. Rainbows. J/RPGs. -Best things ever. Master of the The Last Story. [Prodigy] Has PAL version and currently living in US ^__^