Beyond the 2024 Player's Handbook, Wizards of the Coast often puts out supplements known as unearthed arcana, in which they offer up playtest material that often includes different subclasses.

The Obojima campaign setting supplement for Dungeons & Dragons offers a lot of varied and interesting subclass options, including the college of masks bard. This bard college is highly focused on ...

DnD Beyond reveals some interesting data that shows the current most popular Dungeons and Dragons classes, subclasses, and party compositions.