[PC, PS, XB] Humble Bundle Neverwinter Pack - $0.00 (Worth $19.99USD) @ Humble Bundle
At the very bottom of HB's latest email is a deal for FREE Bonus Content for your Neverwinter Ravenloft account if you don't already have an account, it's also free & so is the base game.
Once you have your key, it won't expire until feb next year, but the Humble deal expires in a month.
EDIT according to the Humble Support page you need to redeem the key via the Arc client - I am gonna try it through my Steam setup and will report back later.
REPORTING BACK: hunted around & discovered you can redeem your key on the arc website no need for arc client if you already installed via steam or play on ps4/xb1