Create an energetic and dramatic techno track in the key of D minor, capturing the intense atmosphere of a sword battle. Incorporate elements of mystery and build suspense throughout the song. Utilize a variety of instruments such as cello, violin, piano, electric guitar, and acoustic guitar to add depth and texture. Keep the tempo fast-paced to reflect the intensity of the battle. Although the track should be long, ensure that it maintains a captivating and engaging flow from start to finish.