Diversion is something that you should have on all DPS jobs that can take it. Since you’re allowed 10 slots for role actions now, you don’t have to worry about picking and choosing which ones to use.

That being said, I have no idea why the SMN was yelling about Piercing Talon. I’m wanting to hope he maybe mean Elusive Jump, since it cuts your aggro in half. But the two don’t even have remotely similar names, so I don’t even know what he was getting at there.