You have a +1 bonus to attack and damage rolls made with this magic weapon.

Soul Devour : Additional when you attack a creature with this magic weapon and roll a 20 on the attack roll, the blade consumes the soul of the creature causing the targets strength to decrease by 1, additionally the Ugvar gains one charge. If the target dies due to the damage the Ugvar gains 3 charges.

Gluttonous Evolution: If Ugvar consumes enough souls in a day (has 3 Charges) the Ugvar shifts form into a larger, jagged blade that seeps in shadow.  Until the wielder's next short rest or long rest, all attacks with this sword deal an additional 2d6 necrotic damage.

Soul Sacrifice: An unwilling sentient creature which disobeys Asmodues's law can be sacrificed to Ugvar via execution by stabbing the creature in the heart. This will allow Ugvar to consume the soul sacrificed allowing him to instantly transform (gain 3 charges).

Sentience: Ugvar is a sentient, this weapon can understand abyssal & common, and can communicate with anyone who's wielded it telepathically. While you are attuned to it, Ugvar also understands every language you know.

Cursed: Ugvar contact demands a soul must be fed to him every week or it will consume part of the users soul. Ugvar is bonded to its user via a contact and the user cant part ways with Ugvar unless they are dead. All souls Ugvar devours are sent to the 9th level of the Nine Hells for Asmodeus to use.

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, The user must form a pact with Ugvar by killing 3 creatures with him, then after a long rest Ugvar will communicate with the user., Damage, Combat, Cursed, Heavy, Reach, Two-Handed, Graze