The Scorpion Glaive is formed when 5 other weapons are combined, The Scorpion Dagger (Dagger of Venom +1), The Scorpion Tail (Quarterstaff +1), the Scorpion Pummeler (Mace +1), and the Twin Pincers (2 twin Scimitars +1). Once combined the Scorpion Glaive is formed. 

The complete Scorpion Glaive, is a magic glaive with +3 to attack and damage rolls, and the following additional properties: 

 1 - If the back end is used to attack as a bonus action using the Polearm Master feat, instead of dealing 1d4 of bludgeoning damage, it deals 1d4 of slashing damage. and forces the target to do a CON 15 save or take 1d4 poison damage.

 2 - Once a day the Glaive can be activated, as an action it transforms into a Giant Scorpion following the user's mental commands for a minute, after that time it reverts back to it’s glaive form.

 3 - Twice a day when hitting with the upper end of the glaive, the wearer can choose to grapple the target instead of dealing damage, if the user is a Warlock with the Pact of the Blade and this Glaive has become the Warlock's Pact weapon, the DC to escape the grapple is the Warlock's Spell save DC, otherwise the Escape DC is 12).

A mysterious voice can communicate with anyone who wields any of the five weapons, and it can grant any person powers if they agree to serve it (Hexblade Patron). The main goal of the voice is to assemble back the glaive.

Proficiency with a Glaive allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Bonus: Magic, Grappled, Damage, Combat, Heavy, Reach, Two-Handed, Graze