Graviton Trooper

Trained to both recognize and alter the gravity of themselves and their weapons, they are able to utilize basic magic in the field of Graviturgy to swing a battle in their advantage.
Graviton Troopers are carefully groomed from a young age to be warriors faithful to the wellbeing of Cusan, and the house of Bairen. 

Dense Weaponry

As an action you can increase or decrease the density of one item you have on your person for 1 minute or until you are incapacitated. When the weight of a weapon is Increased you may add one damage die to a hit, but must roll to hit with -4. When the weight of a weapon is decreased you may add +2 to hit, but critical hits are impossible. You may add an additional bonus die at levels 7 and once more at 13 when weight is increased. You may add +1 to hit when you lighten the weapon at 7 and 13 as well. 

Untethered

As a Bonus Action twice per long rest you can manipulate gravity's affect on you to one degree or another for up to 1 minute or until you are incapacitated . If you increase gravity on yourself, you speed is reduced by 10ft and you have advantage on all strength checks and saving throws. You also cannot be knocked prone. Your jumping distance is halved.
If you decrease gravity on yourself your speed is increased by 10ft but you have disadvantage on strength checks and saving throws.  In addition your jumping distance is doubled. You also have one extra attack for the duration. 

Reverse Pull

You have unlocked the higher tiers of combat focused Graviturgy. As a bonus action you can reverse gravity's pull on you. You automatically adjust your body orientation to match the direction of gravity's pull. If you are in a location with a solid surface above you, you can walk on that surface as you would on the ground. if there is nothing above the ground you float continuously until you make impact with another solid surface. You can also use this feature to walk on surfaces perpendicular to the ground. once activated you can change the direction of Gravity's pull using a bonus action each turn. This expends a use but doe snot increase the duration. This feature lasts a minute or until you are incapicitated.  You can use this feature a number of times equal to your constitution modifier (minimum of 1). This ability can be stacked with Dense Weaponry. Using another subclass ability other than Dense Weaponry will end the effects of Reverse Pull.

Orbital Attraction

Once per long rest you may use your action to tether yourself to any creature or object of size Huge or smaller. For the next 10 minutes or until you are incapacitate the creature or objects movement is halved when moving aways from you and doubled if moving towards you. You gain advantage on attack rolls against that creature for the duration. The creature has disadvantage on attack rolls against you for the duration. This effect cannot be stacked with Reverse Pull.

At level 16, your training in gravity has progressed to an advanced degree  your body is now stronger  than those who are used to normal constraints of gravitational pull. When gravity is normal you now gain 15 ft of movement. In addition you have 1 extra attack per round when gravity is lowered via Dense Weaponry. You have proficiency on all ability checks that use Strength as a modifier. If you already are proficient in one or more of those abilities, you have expertise.

Supermassive Black Hole

You can charge yourself with immense gravitional pull. Choose 3 creatures you can see as an action and you may pull them towards you dealing damage as you do. They must succeed on a constitution saving throw 10+Constitution modifier or be pulled 60 ft towards you. they take 6d10 bludgeoning damage on a failure and half as much on a success. They are not pulled towards you on a success. If they are engaged in combat with another creature, that creature may use an opportunity attack if the pull moves them outside of that creatures combat range.