Detect Sliver

For the duration, you can detect the number of slivers 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. If the creature you choose has zero slivers, the creature is unaffected.

You initially learn if the creature has any slivers--and from what region those slivers came from. As an action, you can either shift your attention to another creature's slivers, or attempt to probe deeper into the creature. If you probe deeper, the target must make a Wisdom saving throw. If it fails, you gain insight into its  quantity of slivers(if any), its class, and sponsor. If it succeeds, the spell ends. Either way, the target knows that you are probing it, and unless you shift your attention to another creature', the creature can use its action on its turn to make an Intelligence check contested by your Intelligence check; if it succeeds, the spell ends.

You can also use this spell to detect the presence of slivered creatures you can't see. When you cast the spell or as your action during the duration, you can search for slivers 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 an Intelligence of 3 or lower or one that doesn't speak any language.

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