The Goal of All Life is Death

 After casting The Goal Of All Life Is Death you need to wait 12 seconds for the spell to activate. After that every creature (except the caster) withing 900ft range have 100% for Instant Death. If the caster get hit he must do a Constitution saving throw with DC equal to his level + proficency bonus. On a failed save the spell fails and can not be casted again until using long rest. On a successfull cast, the spell can not be used again withing 100 hours form the first one.