The Maw (Patreon)

Weapon (longsword), legendary (requires attunement by a Warlock)

If this sword is bound using your Pact of the Blade feature, it gains bonus 1d6 damage of a type appropriate to your patron (fire for Pact of the Fiend, psychic for Pact of the Great Old One, radiant for Pact of the Fey, etc.). This damage type also determines the damage of the weapon’s feature. Consult your DM regarding what damage type would be appropriate.

Rift to Beyond. As an action, you may summon a portal at a location you can see within 60ft. All creatures within 60ft. must make a DC 13 dexterity throw or be grappled by chains/tendrils/vines that deal 1d4 damage and pull the target towards the portal. A small or smaller creature is pulled 15ft. per turn, medium 10ft, large 5ft. Creatures of greater size than large cannot be pulled. At the beginning of its turn, a grappled creature may make a DC 17 strength check. On a successful save the creature breaks free. On a failed save, the creature is pulled closer to the portal. When a creature enters the same space as the portal for the first time on a turn or starts its turn there, it takes 3d8 damage of the chosen type. If this damage reduces the creature’s hit points to 0, it is teleported before your patron in their plane of existence. You may plead with your patron for any loot the creature may have. Once you have used this feature, you cannot do so again until you finish a long rest.

This cruel blade whispers into the mind of its wielder, its words indecipherable but its will is clear: Hunger. Slashing through untold aeons and planes beyond, this blade forms a rift directly to one’s otherworldly patron, dragging their servant’s enemies into their realm. Witnessing such a display of nightmarish power would surely break the will of any foe.