You gain a +3 bonus to attack and damage rolls made with this magic weapon. In addition, the weapon ignores resistance to slashing damage.

When you attack a creature that has at least one head with this weapon and roll a 20 on the attack roll, you cut off one of the creature's heads. The creature dies if it can't survive without the lost head. A creature is immune to this effect if it is immune to slashing damage, doesn't have or need a head, has legendary actions, or the GM decides that the creature is too big for its head to be cut off with this weapon. Such a creature instead takes an extra 6d8 slashing damage from the hit.

This blade can cut open rifts in space,once per day you can cut open a small wormhole that can only be entered by you or your allies.to another point within 160 feet around you,where you can see.and it lasts for an hour or until you decide it closes

once every long rest this blade can summon 3 floating spectral blue blades that the user can control with their mind,every 3 levels the number of blades summoned increases by one,each sword does 1d6 radiant or slashing damage,the user chooses,the blades last for 10 minutes unless destroyed via magical means,they all have 10 hit points.

 

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

Notes: Bonus: Magic, have to have infernal blood, Damage, Combat, Versatile, Sap