(Stormblood spoiler warning due to exerpts from quest conversations)
*I screenshotted some of these before the patch, so it's possible it's fixed.

"becoming joining us" doesn't make sense
Budugan Warrior: It is now clear that your prowess on the battlefield is unparalleled. ...What would you say to becoming joining us? Outsider or not, we would gladly welcome a man of your ability.
Quest: The Ideal Budugan Warrior
Location: Azim Steppe, outside bowl-shaped place