|Attack bonus if proficient||+2|
|Weapon die ([W])||1d10|
|Weapon properties|| stout (primary end)|
off-hand (secondary end)
The primary end of a double axe is a stout weapon, so the primary end counts as a two-handed weapon, for example, benefiting from feats and class features that affect two-handed weapons. The secondary end is an off-hand weapon, so either end can be used to make attacks.
No class has proficiency with the double axe as a class trait, but any character can become proficient by taking a Weapon Proficiency feat.
The November 2009 rules update removed the defensive property from the double axe, and added the stout property to its primary end.