Transparent Blue. Catalog Number: 0727361175245 Color: Blue Format: LP UPC: 0727361175245 Less than one year after their last strike Chapter V: Unbent, Unbowed, Unbroken, the Swedish Heavy Metal kings Hammerfall are back with Threshold. Hammerfall have written some of the most interesting songs in their entire career but have managed to sound varied but without ignoring the purity that True Heavy Metal requires. Threshold truly is a new step to world domination for Hammerfall.