If the wieldier chooses to not resurrect an ally or defeated enemy and let them die the wielder may choose to absorb their essence as "soul essence" that can be stored inside the chalice and used for magical purposes.

Corruption Levels

1. Radiate a field of compulsion (30ft radius) DC 18 wisdom saving throw. All who fail feel an overwhelming urge to obey.

2. Difficult terrain doesn't impede movement, as a bonus action the user can use Gaseous Form

3. Dragons defeated under the wielders control will rise as loyal undead minions, you can control a number of undead dragons equal to twice your proficiency bonus.

4. As an action the wielder can spend 5 essence to create desolate land up to one mile radius. 

5. The wielder's alignment changes to chaotic evil. The wielder may spend 10 essence to unleash an apocalyptic event in a region (the moon and sun disappear from the sky for 7 days) for every minute of the day of the seven days there is necrotic rain that does 10d10 necrotic damage each turn a creature doesn't succeed a DC CON save of24