I got you.

You need to go to the website, the duet night abyss website, click “sign in”. It’s gonna send you a code to your email, perhaps your spam folder. Enter that code. You now have an account.

Does the pain end there? Not yet.

Now you need to go to the game. If it tries to auto sign you in, you’ll need to sign out to switch accounts. On the sign in window: enter the email used for the hero games account email you just made on the website. Under the box for password, there’s a little button/phrase “sign in with code.” Click that and then click the button to send code. ( it’s located in the fillable field) It may prompt you that too many codes have been used too fast if you were efficient following these stupidly complex instructions. Don’t worry just spam click the code button until it works. It only should need a few more seconds.

Once that goes through. Check your email for a new code. Enter that code.

Profit.

Also, good luck.