Avil, The Redeemer's Blade

A masterfully crafted elven curved longsword with runes and inscriptions going along the middle of the blade the edge itself is in pristine condition and as sharp as the day it was made. The Crossguard of the blade is adorned with beautifully carved leaves and the handle of the blade is a simple red leather that seems to be slightly worn out.

Unrelenting Force: The force of those who came before you pushes you to continue the assault no matter the odds as a result you are relentless and those around are a testament to the might of living legends as every strike empowers your blade. When you attack while attuned to this weapon you gain a charge of momentum every time you hit with an attack up to a maximum of 4. Each stack of momentum increases the force damage die by 1.

Pursuit of Perfection: You move to the beat of combat carving a path through the field with deadly grace. As the chaos engulfs you your hand is pushed by an unknown force to break the flow and begin again. When you reach max stacks you must make an additional weapon attack as part of that attack action the attack deals an additional 2d6 force damage whether or not the attack hits your momentum drops back down to 0. Additionally, if an attack misses its mark the momentum stacks drop by 1(subject to change).

Weight of the world: For every step others make you must take 1000 more, be it by your own destructive force of will or the gentle nudge of your ancestors pining for one more step. 
If the 4th momentum attack finds its mark you heal and gain temporary HP equal to half of the force damage dealt.

Living Legend: Whether it was by choice or happenstance it no longer matters the only thing that is certain is the role that has been given to you, a role that you will play out until you die. 
 The blade itself calls for another legend to be born. This weapon is cursed and you cannot unattune from it and you have disadvantage on death saving throws. Additionally while wielding this sword you have advantage on certain charisma-based checks. (DM's Discretion)

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

Notes: Damage: Force, Bonus: Melee Attacks, Attunement by a creature with str score of 19 or more if this is achieved in a magical way (for example a belt of hill giant strengh) the process fails., Versatile, Sap