Discern Shapechanger

For the spell's duration, you can perceive the original form of a shapechanger or a creature that is transformed by magic, as though you had truesight, out to a range of 120 feet.  The spell grants no other benefits of truesight. 

At Higher Levels.  When you cast this spell using a spell slot of 4th level or higher, the range of its effect increases by 30 feet for each slot level above 3rd.