The nightfall trial key, do you keep what you get?

This is my first post, and I know of the the fact that I can be considered a noob here, but it does not matter, I really need to know, at the end of the trial code for the email of the trial key, do you keep what you get, I mean it is ok if my paragon gets deleted, I want to know, will my heroes that I put on my ritualist get deleted?! Please answer this fast, I only have 6 hours left!

Once the key expires, you will not have access to anything except equipment that was gained with it. That access will be returned to you should you pay for the game. So, skills and heroes from nightfall will be locked when the key expires. Put in a good key and anything you've unlocked will be available to you.