Arcane Echo Location

You have found a way to see what others cannot; by expelling your magic outwards and reading the signals that return, you can do the following:

• You have blindsight with a range of 10 feet. Within that range, you can effectively see anything that isn't behind total cover, even if you're blinded or in darkness. Moreover, you can see an invisible creature within that range, unless the creature successfully hides from you.
• Depending on the source of your magic you are able to briefly read the true nature of a creature;
  Choose 2 of the following: Aberration, Celestial, Elemental, Fey, Fiend or Undead.
  As an action you can sense if any creature withing 10 feet of you is of the chosen type for 1 minute.
  You can use this feature a number of times equal to your proficiency bonus per long rest.