You may have to make an NA account for the codes to work, I'm afraid.
The enhancements that came with the pre-order, are not terribly great from what I have heard. And the 'invisibility power' is quite useless. =( You're invisible if you stand completely still. You move an inch and the power toggles off. You honestly aren't missing much, IMO.
"Certain it is and sure: love burns, ale burns, fire burns, politics burns, but cold were life without them." - Romulan proverb
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I don't know if they can help you, but Black Pebble posted this e-mail address: cohmoderation@ncsoft.com for those who did not receive their pre-order codes. That was from this post.
There was also a thread about Europe and pre-orders. Good luck.
"I used to make diddly squat, but I've been with the company for 16 years and have had plenty of great raises. Now I just make squat" -- Me
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Jeah, I know they ain't great but they help for the first 20 levels. Invisibility can be bought it's part of the complete collection items... the enhancements, which I'm after, can't 
I won't open up an NA account because I would lose the ability to play with my friends I have on my server... and I'd lose my veteran awards also...
Edit: Also, Thanks very much Eislor, I'll have a look...
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PPD: "Nothing to see here... move along... move along..."
Hi @all,
I want to ask if there is a way to get in contact with Paragon Studios... The link to their website paragon-studios.net is broken and i need to tell them the following:
I preordered Going Rogue via Gamestop.com. I got everything from them, meaning the boxed Complete Collection and the bonusitem code. But now I have a big problem. The codes won't work as I have a EU-Account and the codes are obviously for US accounts only. So now what sould I do? Perhaps PS does not know, that bonusitems are for US only... I'd really appreciate if they were willing to grant me the items in exchange to my US code. I really love this game but this issue somehow spoils it for me, as I'm always thinking "These 20 levels would really be a breeze if i had the bonus items..." I know that's weak but I can't help it...
What I did:
I contacted NCSoft support. The guys where very fast, and nice and all, but they could not help me.
I contacted Gamestop. They where nice too, but they told me, that their codes only work with US accounts and that they don't have codes for EU accounts.
I really want these items. On my EU account. I'm a collector, you know? So any advice on what i should do?
Thanks in advance.
Have fun!
Schlu.
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PPD: "Nothing to see here... move along... move along..."