Why are the fonts so large?
I believe that users should be able to choose their default font size, and browsers universally choose a default of 16px. In case you don't want to change your user preferred font size because other sites disrespect it, there's a setting available in the looks and appearances area (https://dndsanctuary.eu/index.php?action=profile;area=theme) of the profile.
Why don't you have a better quick quote?
It'll take some time; please be patient.
Is there a manual?
Why yes, there is. View it here (http://wiki.simplemachines.org/smf/Getting_started).
I came from My Opera. What are the differences?
There are fewer differences than on a vanilla Simple Machines installation. The first post is displayed on every page of a forum thread, but this can be disabled in your profile (https://dndsanctuary.eu/index.php?action=profile;area=theme). My Bookmarks is the equivalent to My Opera's subscription manager, but e-mails use a separate mechanism. So if you want to keep track of a particular thread without receiving e-mails, click Add Bookmark. If you want to receive e-mails about updates to a particular thread, click Notify.
I forgot, what are the rules?
There's a link to the T&C (https://dndsanctuary.eu/index.php?action=rules) in the navigation bar on top.