Puya's third full length album finds them continuing on their path of constant evolution, this time moving a few steps forward into the modern metal genre with a greater portion of their music now being riff based; while still retaining a healthy dosage of the Latin instrumental aspects which have helped them capture a truly unique sound. Rather than completely depart from the style founded on their last effort, "Fundamental", the band have instead taken their ideas and focused them, writing songs underpinned with meaty riffs and riotous percussion; while also increasing the general amount of intensity and aggression.

This time around, band frontman Sergio Curbelo's lyrics are more English based; something which will no doubt make the music more accessible to North American crowds, though there are still a few moments where he does express himself in his native Spanish tongue. His vocal range has increased and he carries himself well and as a result his soothing melodies make a bright dynamic contrast as they burst into raw growls and screams that draw support from the ample backup vocals supplied by the rest of the band. Guitars are a lot more abrasive on this outing, utilizing increased distortion and crunch to beef up the tracks. Spliced with some impressive traditional Latin styled playing and even a few traces of flamenco, band guitarist Ramon also cuts loose with the occasional solo, though it is the new found aggressive pitch that ultimately helps raise the heaviness of the material tenfold, with a bundle of rough, chunky grooves. Bass playing is quite catchy, using heady funk based progressions that give a somewhat poignant atmosphere to the songs; while also adding a certain complexity and depth. Meanwhile, percussion is a constant element which permeates nearly every aspect of the bands sound and is perhaps the most ethnic sounding component of their music. With band drummer Eduardo leading the charge, each band member contributes their own flavor of Latin based percussion, adding a vibrant array of sounds that rely upon intelligent playing and intricate placement rather than a pummeling tribal roar. There's also a few horns present again on this release, but their overall inclusion is quite sparse, allowing their toned down incorporation to sound rich and refreshing.

Upon first listen "Union" can feel a bit scaled down, almost to the point of being derivative; fortunately though, it is after a few spins that the albums many layers begin to poke out and flourish. It's a cleverly written effort that revolves around complex musicianship, yet gives off an air of simplicity, making it all the more catchy and digestible. In fact, it's great to see that in this day and age there are still bands who don't jump onto trends and instead prefer to continue cultivating their sound into something that is all their own. The individuality this release possesses is a sheer sign of such a decision and it will be near tragic if the songs contained on it don't help this intriguing act gain the attention they rightfully deserve; for it is the uniting of bold ideas and fresh sounds like this that are in such dire need in today's stagnating new metal scene.