Final answer:
A form of writing based on knightly adventures and supernatural elements is known as romance, characteristic of the Romantic period and evident in works like Walter Scott's novels.
Step-by-step explanation:
A form of writing that is based primarily on the adventures of various knights and often abounds in the supernatural is known as romance.
During the Romantic period, literature often explored themes of chivalry, heroic knights, and elements of the supernatural.
This genre encompasses works that go beyond the realm of realistic narrative to include fantastical elements, much like the tales of Walter Scott and the gothic tales mentioned by Ann Radcliffe,
which contain supernatural and dream-like events in settings like abandoned castles with ghosts and vampires.
Authors like Horace Walpole with The Castle of Otranto and Matthew Gregory Lewis with The Monk contributed to the popularity of these kinds of narratives.