Suffering Beast Glaive

Weapon Heavy, Reach, Two-handed, Monk weapon   A number of times equal to your Wisdom modifier per short or long rest, the wielder may spend an action to dash with incredible speed. You can move up to 15 feet with opportunity attacks provoked by this movement made at disadvantage. After moving, you can make a melee attack with this weapon at a target within range.  On a hit, the target takes an additional 1d6 lightning damage and a Large or smaller creature is pushed away a distance equal to the distance you moved.  If the creature is pushed into a place already occupied by an object or creature, it and the target takes an additional 1d6 bludgeoning damage and stops moving. Uncommon

This fine, shadowsteel glaive has a haft made of a giant, elongated, humanoid forearm with dark purple skin. A large, clawed hand grasps the blade, its fingers occasionally twitching slightly as little arcs of electricity run along between them. A single, large bloodshot eye is inlaid on the back of the hand and it darts around frantically.