The same account and password you type on the game login screen.
There is no separate password for the site. If you can get into the realm, you can get in here.
Your password is not stored anywhere on the site. It becomes a single value the realm checks against its own database, and that value is deleted as soon as it is used.
Your characters, when your account was created, and leaving the public pages if you would rather not appear.
What if someone breaks into the site?
Your password cannot be taken from here, and neither can the material the realm uses to check it: that never leaves the realm. What is stored for your session is a random token you can revoke by signing out.
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