Divine Warning

 You conjure forth a small floating ball of dim white light no bigger than 3 inches in diameter. The ball of light sheds dim light out to 20' and follows you as you move. While casting, you choose a creature type (draconic, giant, undead, etc). If the designated creature type is within 60' of the ball of light, the light turns red and the caster knows the exact distance the creature type is from the ball of light, but not its location nor how many of the creature type is present.