The Scrying skill-line is part of the "World" category in the Elder Scrolls Online and is used for the Antiquities System. The Scrying skill-line lets you scry leads to uncover the location of the lead.
How do you unlock the Scrying skill-line?
To unlock the Scrying skill-line you have to visit the city of Solitude in Western Skyrim, to do that you will have to own Greymoor. Once you are inside the city, head towards the marked building (Antiquarian Circle) in the picture below. You will find a NPC called Verita Numida inside, talk to her to begin your journey!
A more detailed walkthrough on how to unlock the Scrying skill-line can be found in the Antiquities System Guide.
How do you level up the Scrying skill-line?
To level up the Scrying skill-line in the Elder Scrolls Online you have to complete leads and achievements related to scrying. You can learn more about how to level up the Scrying skill-line in the complete Antiquities Level 1 - 10 Grind Guide.
Unites a hexagonal cluster of facets in the Antiquarian's Eye, converting the symbols to match that of the central facet.
New Effect: The ability's range increases by one facet, creating a snowflake-like pattern.
Consumes 1 Magicka Charge.
Claim all facets of the selected type that touch your area of control, as well as matching facets directly adjacent.
New Effect: Dilation now claims ALL contiguous facets of the same type.
Consumes 1 Magicka Charge.