Blasphemous Ascension

You utter a word of power, granted to you by your god/goddess, that can rip the soul out of their living form and send them onto the death domain of their god for judgement. If the creature you choose has 100 hit points or fewer, it will be unable to resist and the spell will take. Otherwise, the spell may potentially backfire. If the creature had more than 100HP the caster would need to make a wisdom saving throw higher than 18. If failed, the caster will receive 1D100 damage as retribution for invoking such an act.