Cruor's Morbid Omen

You divine an omen from a corpse that became deceased within the last 24 hours that you can see within range. If there are no corpses, or the corpse you choose is one you’ve already taken an omen from, the spell fails. Roll a die. On an even roll, you grant one creature you can see within range advantage on the next attack roll, ability check, or saving throw they make. On an odd roll, you grant one creature you can see within range disadvantage on their next attack roll, ability check, or saving throw.