You have killing empowerment. 1 living being count as 1 point of extra life that you can spend as condition upgrade (you can add typical condition of human ,stronger being count as many humans)
Or convert it as currency 1:1000.
Result . Your status . Equal to (?)
Strength - ? living beings fused.
Agility - ?
Durability - ?
Stamina - ?
Life /spiritual energy - ?.
