Simplify the following text for a Grade 8 native English-speaking person.
Original: Mordred is especially prominent in popular Arthurian texts of the modern era , especially in fiction , film , and television , and the comics medium . Some modern Arthurian works such as Marion Zimmer Bradley 's Mists of Avalon replace Morgause as Mordred 's mother with Morgan le Fay ( traditionally her sister ) .
Simplified: Mordred is a character from Arthurian legend .