You can sense magic at great distances for a short time.
You must spend 10 minutes in a trance state. While in the trance, you are unaware of your surroundings and can't take actions or move. Upon leaving the trance, you can sense the presence of magic as far as you can see, hear, taste, touch, or smell. Each round you maintain concentration, you can use your action to gain information about one magical effect or spell that you sense. Such information is at the DM's discretion, but may include the school of magic, how long the magical effect has lasted, when a spell was cast, and so on.
This sense lasts as long as you maintain concentration, and you can safely concentrate for a number of rounds equal to your highest-known spell level. Concentrating longer is dangerous, causing headaches, feeblemindedness, madness, or even death. The DM is encouraged to impose escalating penalties, similar to Exhaustion. The time limit resets after a long rest.
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