Arcane Knight's Sword

Rush Attack. Charge forward and attack the first enemy in your way, possibly pushing them Off Balance, if they fail a Strength Saving Throw (DC STR).This feature has a range of 30ft and does not provoke opportunity attacks. You can use this feature once per short rest.

     Off Balance. The affected entity has Disadvantage on Strength and Dexterity Ability Checks, and Attack Rolls against the entity have Advantage, lasting 2 rounds. Removed by taking damage or when Helped.

Infused Magic. You deal +1d4 Force damage when you hit a target with this weapon.

Arcane Grandeur. Use your Action and Bonus Action to charge this weapon's arcane properties, momentarily transforming the blade into a magical greatsword. You hit every target 15ft in front of you, and the damage is calculated like it was a greatsword (2d6+STR). You can use this feature once per short rest.

You have a +1 bonus to attack and damage rolls made with this weapon.

 

Straight sword embedded with a blue gemstone. 
Weapon of knights sworn to families of nobles known by their mastery of the arcane arts.

These knights' swords could serve as catalysts, letting them wield sorcerous battle skills. Despite numbering fewer than twenty, this power made them a match for even the champions of gold in battle.

Proficiency with a Longsword allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Versatile, Sap