Glaive

A glaive is a reach weapon in the pole arm family.

Description
The glaive is a pole arm that, in its basic form, is a large knife mounted on a long pole. The blade is often augmented with a back spike, perpendicular to the blade or angled forward. An average glaive costs 8gp and weighs 10lbs (4.5kg).

Use
The glaive is a two-handed melee weapon with a 10 foot (3 meter) reach. Because it is a pole arm, it cannot be used to attack adjacent foes. They are most effective in large numbers in a phalanx, or when they can be set against a charging opponent. Even though the tip of the blade is sharp and the back spike could be swung to penetrate armor, the glaive is considered a slashing weapon.

Realmslore
Bearded devils have been known to carry sawtooth glaives.