A deal with whispers was made, power was gained. Legion rises.
Corrupting Whispers
Starting at 4th level, when you reduce a hostile creature to 0 hit points, you gain temporary hit points equal to your Proficiency modifier + your level (minimum of 1).
Corrupting Whispers
Starting at 6th level, you can call on your patron to alter fate in your favor. When you make an ability check or a saving throw, you can use this feature to add a d10 to your roll. You can do so after seeing the initial roll but before any of the roll's effects occur.
Once you use this feature, you can't use it again until you finish a short or long rest.
Aura of Death
At 6th level, Legion's powers have a profound effect on your body and magic. You don’t need to eat, drink, or breathe.
In addition, once during each of your turns, when you hit a creature with an attack and roll damage against the creature, you can replace the damage type with necrotic damage. While you are using your Aura of Death you can roll one additional damage die when determining the necrotic damage the target takes.