Magic Blade. You gain a +1 bonus to attack and damage rolls made with this magic weapon. You can use your spellcasting ability instead of Strength/Dexterity for the attack and damage rolls of melee attacks using that weapon. 

Gaia's Wrath. Once on each of your turns when you hit a creature with a weapon attack, you can cause the attack to deal an extra 1d8 cold, fire, thunder, acid, poison or lightning damage (your choice) to the target. When you reach 14th level, and are attuned - the extra damage increases to 2d8.

Primordial Bulwark. When you or a creature within 5 feet of you takes acid, poison, cold, fire, lightning, or thunder damage; you can use your reaction to grant resistance to the creature against that instance of the damage. 

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This magic weapon was re-created by Cameron the Clairvoyant, a greater wizard than even Gandalf and Merlin! 

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

Notes: Bonus: Magic, Damage: Additional, Prone, Damage, Combat, Versatile, Sap