Drazgomot's Mental Tether

You bind and constrict the mind of one creature you can see within range with an excruciatingly painful psychic tether. The target must make a Wisdom saving throw, taking 3d8 psychic damage on a failed save, or half as much damage on a successful one. On a failed save, the following happens:

You always know the target’s location until the spell ends, but only while the two of you are on the same plane of existence. While you have this knowledge, the target can’t become hidden from you, and if it’s invisible, it gains no benefit from that condition against you.

You can read the target's surface thoughts until the spell ends. On each of your following turns as long as the spell is still active, as a bonus action you can choose to tether more deeply into the target's mind. The target must make a Wisdom saving throw, taking 1d8 psychic damage on a failed save or half as much on a successful one and the spell ends. If the target is killed by the damage, then you learn nothing further.