13 are loosely based on  the original novels #3,4,6,7 in the Lodoss War series. The story  developed in these last episodes is unique to this animated series  from the original story Mr. Mizuno developed. The later animated  series "Record of Lodoss War: Chronicles of the Heroic Knight"  follows the original novels and "corrects the record" starting after  the end of episode 8 of this series.