Guild Wars 2

You will need Mastery level 3 so you can speak with the Merchant (Nuhoch Lore).
At the started area at Tangled Depths [The Tangled Descent] near the waypoint [Order of Whispers Camp Waypoint] is the one of the 2 Nuhoch Mastery Vendors at this map.The sad part is if you make the exotic Insignia to change at Mystic forge your old Ascended armor,insignia its not show up at Mystic Forge Boxes.Hope Arena Net will fix it soon.

Exotic insignia/inscription recipe cost : 250 Ley Line Crystals and 10 silver.
Ascended insignia/inscription recipe cost : 600 Ley Line Crystals and 3 gold.

Hope i help you.
With Respect Icelove.

1) You will need level 3 Nuhoch Lore Mastery so you can speak with the Merchant.
2) The Merchant is at the started map waypoint area at Tangled Depths.
3) Insignia/inscription cost 250 Ley Line Crystals each.
4) I was make the Insignia but it seems a bug because when i was ready to make the new piece of armor at Mystic forge the Insigia dont show up at Mystic Forge boxes.

Hope i help and Good Luck.