Thrown weapons are anything small enough or balanced enough to be picked up and thrown at an enemy. Some light melee weapons are also balanced to be used as thrown weapons. Your Thrown proficiency is based on your Dexterity, but uses your melee damage bonus rather than your ranged damage bonus to determine damage. Some weapons are thrown weapons and also fall under a different weapon group, such as spear or light blade; you always use your Thrown proficiency when using the weapon at range, and use the weapon's other proficiency when performing a melee attack with that weapon.
The area is filled with smoke, which grants partial concealment if line of sight passes through one to two spaces of smoke, or total concealment of line of sight passess through three or more spaces of smoke.
The attack scatters 1d4 paces in a random direction for every 5 points that your check result missed the difficulty by - roll 1d8 to determine direction.