Mob Levels

[REDace0]

If going for the achievement, I recommend running a zone every play session with a group of friends. Those that have the gate can act as decoys to buy you and others time. Taking turns as needed until everyone has the gate.

That's cheating! >:-O

Kidding, but I agree with your post. I'd like to add that there's a third type of aggro, called alternately "true sound" or "scent", where walking will only halve the detection radius, rather than eliminate it. Mobs with this aggro type include, most annoyingly, boars.

For these you either need to run by on chocobo and pray, wait for them to move out of the way, or use Wrist Flick to stun them and then hope you can get far enough past them after they recover.

Might as well mention that there is a small chance to evade even these high-level mobs. I managed to dodge an attack from a L70 boar on my way to... Longroot, I think, as a 21CUL.