To get the Steam exclusive in-game cloak, “Spiked Cloak of Vapors”. (It is named “Barbed Cloak of Vapor” ingame). You need to download Age of Conan client from steam and register your new account through the client.
People may wonder if this pack can apply on existing account or not. Yes it can apply on existing but not a new one only. You will get a code in steam and you can register it in account page.