Thirteen Bled Promises from Madrid deliver deathcore with the visceral, blood-soaked imagery their name evokes since 2010. Over a decade and a half of activity from the Spanish capital, they have honed their approach to breakdown-driven brutality.

Thirteen Wars is a thrash metal band from Eisenach/Mihla, Germany, formed in 2011. They play aggressive, riff-driven thrash metal from the Thuringian underground.

Thirty Aethyrs from Manchester craft progressive and black metal named after the thirty ethereal realms of Enochian mysticism since 2011. Over a decade of esoteric compositions from the northwest has explored each mystical plane through technically ambitious extremity.

Thirty Fates is a heavy metal band from Larissa, formed in 2021. Their music delivers classic heavy metal from the Thessalian capital, drawing from the mythological concept of fate central to Greek culture.

This Broken Machine from Milan blend progressive metal and metalcore with alternative rock influences since 2012. Over a decade of malfunctioning-machine compositions from the Lombardy capital.

THIS GIFT IS A CURSE formed in Stockholm, Sweden in 2008, founded by vocalist Jonas A. Holmberg and drummer Johan Nordlund, with their debut EP recorded at the legendary Sunlight Studios with producer Tomas Skogsberg in 2010. The band works in a cataclysmic fusion of black metal, sludge, and hardcore, constructing songs that balance ferocity with a suffocating, doom-laden atmosphere. Full-lengths I, Guilt Bearer (2012), All Hail the Swinelord (2015), A Throne of Ash (2019), and Heir (2025, released on Season of Mist) have steadily built their standing in the European extreme underground.

This I Owe is a progressive heavy/doom metal/hard rock band from Athens, formed in 2023. Their music blends progressive complexity with the weight of doom and the accessibility of hard rock.

This Illusion from Padua deliver death metal that shatters false perceptions since 2004. Over two decades of deception-destroying compositions from the Veneto university city.

This Is Past is a psychedelic black metal band from Athens, active since 1999. With over two decades of exploring the intersection of psychedelia and black metal, they are among the more veteran experimentalists in the Greek underground.