To access the Instance, you need to gather Cryptos Fragments and turn them into Tablets (grey, green, blue and so on). Each colour opens the next room of the Instance.
Each room is suitable for different level range, from the easiest to the hardest.
To access this instance you need cryptos fragments droppable from Bags bought in Trade Fair (and Smugglers but not sure) instance depends on the lvl of the player and the color of the cryptos you already possess.Out of this instance you can get a lot of achievements,quicksilver (dependable on your char lvl,the lvl of the mob you defeat aswell as the reputation in "Juggernaut rep".As an addition you can also find icy branch,and item which can be traded at guild of artisans for various pots (including Icy dragon elixir).
The quest starts from Harcide Nest, you have to click on a casket in the location screen and take a drop from there.
You'll find a strange device. clicking on it you'll start the main quest.
Lv 5 - start Harcide Nest
Lv 6 - Quest from sailor Galash at vurdalia
Lv 8 - Quest from sailor Galash at vurdalia
Sorry, for my bad english is not possible to recover the name of the quest, I did them on IT.