You draw your abilities from the other spirit that dwells within you. It grants you powers at 3rd, 7th, 11th, and 15th levels.

Spirit Inhabitant

When you choose this archetype at 3rd level, you form a connection to a spirt of the dead who will aid you in your endeavors. Your wraith gives you access to some of their knowledge they contained in life. You gain proficiency in one skill of your choice.

Spectral Blast

When you reach 7th level, you have learned to repost those who would try to do you harm. As a reaction to a melee attack made against you, you can force all enemies within a 15 foot cone in the direction of the enemy to make a Strength saving throw. All creatures caught in the blast who fail take force damage equal to two rolls of your Spectral Weapon and are pushed back 10 feet, on a success they instead take half damage and are not pushed. A creature that gets pushed into another creature or solid object takes bludgeoning damage equal to your wisdom modifier.

At 18th level the damage increases to three rolls of your Spectral Weapon Die

Dominating Grasp

Upon reaching 11th level, your connection to the wraith allows you to alter the minds of other creatures you touch. A number of times per day equal to your proficiency, you can force one creature that you are grappling to make a wisdom saving throw against your spell save DC or be under the effect of the spell “Dominate Person” without expending a spell slot. A creature charmed in this way will treat you as a close ally for one minute, after which they will become hostile towards you.

Wraith's Fury

Upon reaching 15th level, you can release the power of the wraith within you. As time seems to slow down, you let loose a flurry of attacks against enemies around you within a 60 foot radius centered on yourself. You can attack a number of creatures equal to half your level plus your Wisdom modifier, using your Wisdom as your attack modifier. Any creature you hit takes damage equal to your wraith weapon die. You can target a creature more than once, but no more than five times. After using this ability, you must complete a long rest before you can do so again. 

Spectral Weapon

When you choose this subclass at 3rd level, your wraith adds their touch to your weapons. You add extra extra force damage to your weapons equal to a d6.

This damage die increases to a d8 at 7th level, and to a d10 at 15th.