The Javelin is a throwable object that is similar to the bow and arrow.
You can throw it by holding right mouse button while wielding it. It does more damage than arrows, but travels less distance and has a large deviation. You don't need feathers to craft them, or a bow to shoot them. If you fall downwards and throw the javelin downwards, it will have a critical hit. Same as when you are aiming upwards.
Stabbing: 1 Damage (1/2)
Throwing: 4 Damage (2 Hearts)