As in previous Assassin's Creed games, in AC Mirage, you will be able to complete quests on behalf of several characters that you will encounter during your adventure and Nеhаl is one them. She will ask you to complete a quest called The Calling. In order to complete this you’ll have to find 10 Shards and the Ancient Place.
To locate the Ancient Place that Nahel mentioned. You must go to the Northern Oasis, which is located in the wilderness close to the city of Anbar, You can find equipment within that is shielded by energy barriers and you must use shards to access it.
Here is the Ancient Place location map: