Gravity Blade

Through intensive study and training you learned how to use the natural attracting force between all thing to amplify your abilities in combat.

You use  your Intelligence when calculating your save DC.

Gravitic Sink

At 3rd level, as an action, you can make your proficiency bonus amount of large or smaller creatures of your choice within 30ft make a Strength saving throw against your save DC, or they must use thier turn to make one attack against you and are pulled 15ft toward you.

At 10th level, you can affect a single huge or larger creature.

You can use this ability your proficiency bonus amount of times per long rest.

Mass Driver

At 3rd level, you can strengthen your attacks by increasing the mass of the attack.

Once during your attack action when you hit with a melee or thrown weapon attack, you can add an additional 2d4 force damage to the attack and can choose to push that creature up to 10ft away from you.

You can use this ability your proficiency bonus + intelligence modifier times per longrest.

The damage increases at 8th (3d4), 11th (4d4), and 17th (5d4). Also at 15th level you can use your Mass Driver on all your melee attacks.

Almighty

Starting at 7th level, when using your Action Surge ability, you can target your Intelligence modifier creatures within 60ft of you to push or pull toward yourself. That creature must make a Strength saving throw against your Save DC or be moved up to 60ft toward or away from you and be knocked prone. A willing creature automatically fails the saving throw and is not knocked prone. 

Cushing Force

At 10th level, as a bonus action, you can spend your movement to "fall" toward a point in space within twice your walking speed. While doing so, you do not take attacks of opportunity, and if you "fall" into a creature, that creature must make a Dexterity saving throw or take 1d6+1d6 (for every 5ft past 10ft to the max of 40ft or 6d6) force damage or half on success. You can use this ability once per short rest.

Large ot greater-sized creatures make the saving throw at disadvantage.

Master of Gravity

Starting at 15th level, you can cast the second-level spell levitate twice per long rest on yourself.

Event horizon

At 18th level, your mastery of gravitic forces allows you to create a localized black hole centered on yourself that drags in your foes. 

As a bonus action, once per long rest, you can make all creatures of your choice within a 30ft radius centered on you to make a dexterity saving throw or be pulled 10ft toward you or to the nearest available space, and cannot move away from you. They must make the save each turn they remain in the area, and you must maintain concentration as if this is a spell. This last for 1 minute, you lose concentration, or until you dismiss the effect.