To learn Nightwish - Amaranth chords, grasp the musical fabric of the song with this sequence - Bb, C, D, Em, F, Dm, Bb, C and Dm of chords. A strategic approach would be to train at 64 BPM initially, and then accelerate to the song's tempo of 128. With D Minor as the song's key, tweak the capo to cater to your vocal pitch and chord likes.