Nimue verch Wledyr ap Gwyn, known as the Lady of the Lake from Andrzej Sapkowski's The Witcher series, is a sorceress who becomes pivotal in the saga's end, notably in "The Lady of the Lake." Living long after Geralt's time, she studies his history and aids Ciri's temporal travels with her extensive magic and historical knowledge.
I developed this concept during the mentorship with Marek Madej at CAA.