Final answer:
Morgana Le Fay is portrayed as a sorceress who creates a test for Sir Gawain, and she is also his aunt in Arthurian legends.
Step-by-step explanation:
Morgana Le Fay is a character often depicted as a powerful enchantress or sorceress in Arthurian legends. In the context of the stories involving Sir Gawain, she is the one who devises the moral test he must face, which reveals her to be not only a figure of mystique but also his aunt. This complex relationship adds depth to the narrative, illustrating how familial ties can intertwine with the chivalric adventures and trials that the knights of Arthurian legend typically undergo.