Viper eyes

You touch a willing creature to grant it the ability to see via detecting heat signatures. For the duration, the creature has blindsight out to a range of 60 feet. However, this heat-based vision renders the creature especially sensitive to sudden flashes of light or heat. When the creature is subjected to fire or radiant damage, they must make a Constitution saving throw; the DC for this save is equal to 10 or half the damage taken, whichever number is higher. On a failure, the creature is disoriented and the spell ends early.