After seeing about 300 questions over OT OOC in a day, I decided to post this. I didnt -see- any previous posts about it, so if I missed some, sorry.
Thrak Quest Steps:
First you need to have a bracer from Scientist Drake in the Jobe training ground. If you don't have one, talk to him and tell him so and he'll give you one. You don't need to actually do ANY of his tests, but you DO need the bracer.
After you get the bracer, kill mobs to get FIVE (5) Insiginia of Thrak items. I got mine off of the crippler of growth's near the Unredeemed village.
Once you have 5 of them, go to the Thrak statue at (insert coords).
Talk to Veronica and go through her taunting to get the Ancient Device.
Take the Ancient Device to Prophet Yutto in the Unredeemed village. He's in the NE corner (first left when you come in from the north). He will want to look at the device, then will tell you to bring him proof of Thrak. This is where you show him one of the Thrak insignias. He will look at it and GIVE IT BACK after telling you to go to the Gardens of Thrak to talk to someone about the Device there. He also gives you a quest which you can do by just targetting the Statue of Thrak before you go into the garden and waiting a minute.
Once you go to the statue of thrak again, use one of your insignias to get into the gardens, and find Hypnagogic Urga-Lum Thrak (Coords 464, 359 in Thrak Garden). Talk to him and he will want to see the device as well. He gives you a quest to capture three souls with it. Leave the gardens via the statues to the north and take hte Nascene Frontier 1 statue. Combine an insignia with the Ancient Device, then find a Swift Silvertail. Note: It MUST be a Swift Silvertail, not a cursed or blessed one.
Once you right click the silvertail, go through the dialog and give it the COMBINED ancient device (The one you combined with the insignia of thrak). It will give you back the plain ancient device and turn into a cursed swifttail.
Do this two more times, making SURE YOU COMBINE THE ANCIENT DEVICE with the insignia of thrak (not sure if they will keep the plain ancient device or not, but didnt try
Once you have done this, go back to the gardens and find Hypnagogic Urga-Lum Thrak again and talk to him. He will ask for the device again, and will give you the wonderful Key to the Garden of Thrak!
I don't know all the uses for this key, but I know fixers can warp to the gardens with The Key to the Garden of Thrak and the Nano Crystal (Tap Notum Vein: Nascene)
Hope this helps! Enjoy!