X, Y, Z is a progressive death/thrash metal project from Rosice, Czech Republic, formed in the late 1990s from the ashes of defunct band Monastery. Masterminded by multi-instrumentalist Igor Mores, who has played in bands like Hypnos and Forgotten Silence, the project blends drone, jazz, and extreme metal into experimental compositions across releases like "UnCommon Space" and "The Right Way of..."

X-Calibur is a heavy metal band from Neuchatel, Switzerland, formed in 2018. They play classic-style heavy metal with a strong emphasis on powerful riffs and anthemic songwriting in the tradition of European heavy metal.

X-ULL is a death/doom metal trio from Lodi, Italy, consisting of Samuele, Paolo, and Francesco. Their 2025 EP "Last Hope X-3" weaves apocalyptic narratives inspired by Richard Matheson's "I Am Legend" across five crushing tracks of slow, atmospheric death doom.

X.Kernel is a melodic death metal/metalcore band from Kyiv, Ukraine, formed in 2013 and heavily influenced by the Gothenburg MDM scene. Their 2017 debut album "Face the Truth" on Cimmerian Shade Recordings was praised for its techy, grooving melodic death metal that explores themes at the intersection of physical and virtual realities.

X.T.O. is a death metal band from Kongsvinger, Norway, formed in 2007. Hailing from the country that gave birth to some of extreme metal's most notorious acts, they deliver unrelenting death metal with a distinctly Norwegian edge.

Xaar is an industrial groove metal and metalcore band from Glasgow, Scotland, formed in 2022. Self-described as "Dark Metal From Scotland," they release hard-hitting tracks like "Leper Messiah" and "Destabilize" that blend industrial heaviness with groove-laden metalcore aggression.

Xadoom is a gothic metal band from Udine, Italy, formed in 1999. As one of Italy's longer-running gothic metal acts, they blend dark atmosphere and melodic sensibility with heavy metal instrumentation in the tradition of the Italian gothic metal scene.

XAge is a thrash metal and hardcore band from the Vysocina Region of the Czech Republic, active since 2017. They fuse the aggression of thrash metal with hardcore punk intensity, delivering fast and furious crossover that hits with relentless energy.

Xalvorn is a one-man black metal project from Leiria, Portugal, started in 2025 by a 16-year-old musician immersed in misanthropy and the occult. Despite the creator's young age, the project already has several releases including collaborations with Lord Pedrial, channeling raw black metal described as "blood-soaked riffs and war-torn visions."