|Attack bonus if proficient||+2|
|Weapon die ([W])||1d8|
|Weapon properties|| defensive, stout (primary end)|
off-hand (secondary end)
The primary end of a double flail is a defensive weapon, so a character proficient with the double flail gains a +1 bonus to AC while wielding it. The primary end is also 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 flail as a class trait, but any character can become proficient by taking a Weapon Proficiency feat.
The November 2009 rules update reduced the weapon die for both ends of the double flail from 1d10 to 1d8, made only its primary end defensive, and added the stout property to its primary end.