Bladesinger's Hymn

You call forth the very essence of arcane from all available sources around you to empower your weapon.

Siphons the remaining life force and soul of the dead within a 60 feet area with the caster in the center. Only affects the dead and unconscious. Once casted, creatures in the unconscious state will immediately die regardless of their current death saving roll status and cannot be revived. Any dead creatures can't also be revived.

Each life force and soul you siphon adds a +1 to your weapon's attack roll to hit and a 3d6 to your damage. 

After each successful attack, you or a chosen ally that you can see will receive half of the damage you dealt. If there's only one ally left, the caster takes a quarter of the damage dealt instead.