Slabsword (5e Equipment)
From D&D Wiki
Martial Melee Weapons
A thick sheet of crude metal fashioned into an unruly greatsword. One end has been fashioned into a point and honed to a brutal edge, while the other has been heated and drawn into a tang to which adhesive resin as been applied before being leather-wrapped to form a secure hilt with as much reduced handshock was possible. The impact from this weapon is sure to create tremors.
Expensive. A character can never gain this weapon as starting equipment from their class.