You have glimpsed pure oblivion, and now that power flows through you. Void Blade's Chanel the destructive magic of oblivion you decimate their enemy's. They augment their attacks with oblivion and can even launch rays of pure destructive energy.

Oblivion sword

 Beginning at level 3, you can summon a magical sword made out of pure destructive energy to smite your foes with. The blade will function only for you. You can summon the blade as a bonus action and it uses the oblivion blade attack. The saving throw is equal to 8+ your proficiency bonus + your constitution modifier. 

Oblivion Blade

Weapon Category: Martial Melee weapon

Damage on hit: 2d6 force + strength, The damage increases by 1d6 at 9th and 15th level, and by 2d6 at 20th level.

Properties: Two Handed, Heavy

Mastery: Graze

Teachings of the void.

You have seen the void, and so learned from it. You gain proficiency in intimidation, as you can channel the horrible truth of the void. In addition your eyes become inky pools of nothingness and your skin becomes a swirling black.

Debilitating blades

At level 7 you can inflict additional harm on those who get hit by your void blade. Whenever someone fails the saving through of your void sword attack by 5 or more you can use your reaction to Inflict one of the following conditions upon them. You can use this feature a number of times equal to your proficiency bonus, you regain all expended uses upon a short or long rest.

• You can knock them prone if the are large or smaller
• You can disintagrate one piece of non-magical gear they are wearing, provided it is a tiny or small object.
• You can cause them to loose resistance to one damage type until their next turn
• You can give them disadvantage on their next attack roll
• or you can give them 1 level of exhaustion, exhaustion from this source only goes up to 5 levels

Void Pocket

You have learned how to store things in the void. Beginning at 10th level you can use a action to store something in your void pocket, the void pocket can hold up to 200 tiny objects, 100 medium or small objects, or up to 50 large objects, you can have any combination of objects as long as they do not exceed size maximum, in addition you cannot fit huge or larger objects or creatures, when you die all the objects are expelled into the nearest unoccupied space. You can reach Into the space an withdraw any object stored within, as long as you could pick it up, if you could not you must say the objects name and then the object will appear, this however take 1 minute while reaching in takes an action.

Nullify spell

You have learned to use the power of oblivion to quench an enemy's spell casting. When an enemy cast's a spell while within 60ft of you, you can use your reaction to attempt to absorb that spell into your blade. You make an attack roll against the enemy's spell save DC, if the attack hits you nullify the spell, as long as it is 7th level or lower. However the damage of your blade is reduced by an amount of d6's equal to the spells level, if this would reduce it to 0 or below d6's of damage your blade disappears and you cannot summon the blade for a number of turns equal to one plus the amount of d6's below zero you reduced it too. 

Maleable force

You have learned to channel your blade into a destructive ray. Beginning at 18th level you can use an action to channel your sword into a ray, you dismiss your sword and immediately cast disintegrate. at 7th level, you cannot summon your sword the turn you take this action. You can use this action a number of times equal to your proficiency bonus. You regain all expended charges over a long rest. In addition when you take force damage you can use your reaction to take no damage instead and summon your blade. You can use this feature once per long rest.