Detect Vitality

For the duration, you can see the life force of certain creatures. When you cast the spell and as your action on each turn until the spell ends, you can focus your mind on any one creature that you can see within 30 feet of you..

You initially learn the general health of the creature--such as whether they are bloodied or not. As an action, you can either shift your attention to focus on another creature's specific circumstances. If you probe deeper, the target must make a charisma saving throw. If it fails, you gain insight into its exact hit points(if any), any diseases affecting it, and its statistics are the only ones you can gain more insight into for the duration of the spell. If it succeeds, the spell ends.

Combat tends to affect hit points, so this is a potent spell to gain information on a specific enemy.

You can also use this spell to detect the presence of creatures you can't see. When you cast the spell or as your action during the duration, you can search for life within 30 feet of you. The spell can penetrate barriers, but 2 feet of rock, 2 inches of any metal other than lead, or a thin sheet of lead blocks you. You can't detect a creature with less than one hit point.

Once you detect the presence of a creature in this way, you can focus on it for the rest of the duration as described above, even if you can't see it, but it must still be within range.