On a critical hit, the weapon adds a weapon damage die of the listed size. Roll this after doubling the weapon's damage. This increases to two dice if the weapon has a greater striking rune and three dice if the weapon has a major striking rune. For instance, a rapier with a greater striking rune deals 2d8 extra piercing damage on a critical hit. An ability that changes the size of the weapon's normal damage dice doesn't change the size of its deadly die.

The weapon is suited for mounted combat with a harness or similar means. When mounted, if you moved at least 10 feet on the action before your attack, add a circumstance bonus to damage for that attack equal to the number of damage dice for the weapon. In addition, while mounted, you can wield the weapon in one hand, changing the damage die to the listed value.

This weapon can be used defensively to block attacks. While wielding this weapon, if your proficiency with it is trained or better, you can spend a single action to position your weapon defensively, gaining a +1 circumstance bonus to AC until the start of your next turn.

You can use this weapon to Shove with the Athletics skill even if you don't have a free hand. This uses the weapon's reach (if different from your own) and adds the weapon's item bonus to attack rolls as an item bonus to the Athletics check. If you critically fail a check to Shove using the weapon, you can drop the weapon to take the effects of a failure instead of a critical failure.

Something of uncommon rarity requires special training or comes from a particular culture or part of the world. Some character choices give access to uncommon options, and the GM can choose to allow access for anyone. Less is known about uncommon creatures than common creatures. They typically can't be summoned. The DC of Recall Knowledge checks related to these creature is increased by 2.