# *Detect Magic* will work

As you've quoted, the first sentence of **[Create Thrall][1]** specifically states it is magic(my emphasis):
>At 14th level, you gain the ability to infect a humanoid’s mind with the alien magic of your patron.

It is clear that this is magic, and should therefore be detected by *[detect magic][2]*.
>For the duration, you sense the presence of magic within 30 feet of you.

## But what will it say?
Unfortunately, not much RAW, just that there is magic there. It'll be up to the players/DM to determine if anything more is disclosed and what that would be - or provide clues towards that if they don't want to outright disclose it in entirety.


  [1]: https://www.dndbeyond.com/classes/warlock#TheGreatOldOne
  [2]: https://www.dndbeyond.com/spells/detect-magic