TBD
Starting at 1st level,
Starting at 1st level, when a creature targets you with a weapon attack, you can use your reaction to impose disadvantage on the roll.
At 3rd level, WIP
Once per turn, when you hit a creature with an attack, you can force that creature to make a Strength saving throw or drop one item of your choice that it is holding. The DC for this saving throw is equal to 8 + your proficiency bonus + the ability modifier you used for the attack.
Stronger?
Dampen. When you hit a creature with an attack roll, you can use a bonus action to force them to roll a Dexterity saving throw. On a failed save, you place a dampening curse on a nonmagical weapon they are holding. Until the start of your next turn, attacks with that weapon deal only half damage.
Disarm. When you hit a creature with an attack roll, you can use a bonus action to force them to roll a Strength saving throw. On a failed save, the creature drops one item of your choice that it is holding. The item lands at its feet.
Distract. When you hit a creature with an attack roll, you can use a bonus action to force them to roll a Wisdom saving throw. On a failed save, the creature is briefly distracted and cannot make more than one weapon attack during its next turn, regardless of the creature's abilities or magic items.
Unbalance. When you hit a creature with an attack roll, you can use a bonus action to force them to roll a Dexterity saving throw. On a failed save, you attach a heavy weight on a weapon they are holding, negatively affecting its balance and weldability. Until the start of your next turn, attacks with that weapon have disadvantage.