a book (A)

You gain an innate sense of creatures whose existence is an insult to the void. If you spend
1 min in uninterrupted contemplation, you can determine the presence and nature of undead and fiends in the area. This detection extends up to
1 mile in all directions. You learn the number of
undead and their distance and direction from you.
In addition, you learn the creature type of the
undead in that area that has the highest challenge rating. Once you use this feature, you can't use
it again until you