Epic Slavic Pagan Symphonic Metal, male deep tenor and female deep mezzo-soprano duet, powerful male choir, tempo 140-150 BPM, key D minor. Distorted electric guitars, heavy bass, double bass drums, full symphony orchestra with strings, brass, and choir. Majestic, ecstatic, wise, divine, pagan, folk atmosphere. Structure: intro with wind and wargan, crescendo orchestra, heavy drum break; verses with call-response between male and female; choruses with full choir and galloping double bass; instrumental solo with folk guitar lick and symphonic interlude; bridge with a cappella canon; final chorus with maximum power and double bass blast; outro fading with strings, bells, and solo female echo. Use dynamic contrasts: quiet mystic moments, then explosive orchestral hits. Make it memorable, hymn-like, closing track of an album.