A longspear has reach. You can strike opponents 10 feet away with it, but you can’t use it against an adjacent foe. If you use a ready action to set a longspear against a charge, you deal double damage on a successful hit against a charging character.

Simple, Two-Handed Melee
Cost: 5gp, Weight: 9lb
Reach: 10 ft.
Dmg (S): 1d6, Dmg (M): 1d8, Dmg (L): 2d6, Critical: x3, Piercing

Source: Player's Handbook
