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Special Weapons
Weapons with special rules are described here.
Boomerang. If you are proficient with the boomerang and make a ranged attack with it and miss your target, the boomerang immediately returns to your hand. If you don't have a hand free, it falls to the ground in your space.
Rope Dart. This weapon adds 10 feet to your reach when you attack with it, instead of the usual 5 feet for a reach weapon.
War Fan. This weapon is difficult to distinguish from a regular fan. An observer who hasn't seen you attack with it can use an action to examine the fan. If they succeed on a DC 15 Intelligence (Investigation) check, they realize that the fan is a weapon.

Special Weapons
Weapons with special rules are described here.
Boomerang. If you are proficient with the boomerang and make a ranged attack with it and miss your target, the boomerang immediately returns to your hand. If you don't have a hand free, it falls to the ground in your space.
Rope Dart. This weapon adds 10 feet to your reach when you attack with it, instead of the usual 5 feet for a reach weapon.
War Fan. This weapon is difficult to distinguish from a regular fan. An observer who hasn't seen you attack with it can use an action to examine the fan. If they succeed on a DC 15 Intelligence (Investigation) check, they realize that the fan is a weapon.