Dragon Hunter Axe question

There is nice S grade axe with description:

blunt/2handed

Anyone know what masteries is used for this weapon - blunt, 2handed or both?
And what are critical ratio for this weapon - same than 1handed blunt (low) or similiar to 2handed swords?

Both masteries apply to it just like to 2handed swords. The critical rate is that of a 1handed blunt type weapon.