AMORPHIS announce N American tour with DARK TRANQUILLITY, MOONSPELL and OMNIUM GATHERUM Melancholic progressive metallers AMORPHIS will return to North America with a co-headlining trek with DARK TRANQUILLITY this September/October. Joining them are Portugal’s premiere gothic-metallic-force MOONSPELL, and Finnish melo-death contingent OMNIUM GATHERUM. AMORPHIS will be touring in support of their…