the material component for this spell may not be substituted with a spellcasting focus. 

choose a target within range.

that target takes Xd8 radiant damage where X is equal to the number of ounces of human blood in the user's possession rounded down to the nearest whole number. the blood is consumed as the spell is cast. the blood does not need to be contained and can be in any form within a 5 foot radius from the user.

If human blood cannot be obtained through other means, this spell will deal necrotic damage in d4s to the user equal to the number of radiant d8s dealt to the target. this alternative method may only be employed if the user is human or half human. Users can deal up to 6d8 this way taking a point of exhaustion for each additional d8 following it. If the user attempts to deal more than 11d8 damage they fall unconscious and the spell fails unless they succeed a constitution saving throw at disadvantage.

when cast at higher levels points of exhaustion are delayed by 2d8 for each level above 5th