Hermonh is a one-man black/death metal project from Osorno, Chile, operating under the name Pattross. The project debuted in 2025 with the EP "Ex Luto Deus Barbariae," a three-track release featuring tracks Azael, Barbarie, and Nephilim.

Hernán Cirigliano is a guitarist and composer from Hurlingham, Argentina who self-produces his progressive and heavy metal recordings, handling guitars, keyboards, and drum programming. His 2019 album "Tormenta Solar" features a keyboard solo by Dream Theater's Derek Sherinian on the track "El Dato Sería Clave," with bass, mixing, and mastering handled by Marco Ignacio Toba.

Hernán D'Ambrosio is a doom metal and acoustic artist from Necochea, Argentina who released the EP "El espíritu del fuego" in April 2022, produced and recorded between 2021 and 2022 with a self-described doom atmosphere and introspective concept. He also plays guitar and vocals in the Necochea sludge/doom band Montibus alongside drummer and multi-instrumentalist Facundo Bávaro.

Heráldica de Mandrake is a doom metal band from Chile, evolving out of the earlier project Mandrake (2014–2017), whose members include vocalist and guitarist Francisco Visceral Rivera and drummer Cristian Rivera. The band has released several albums blending crushing doom with progressive and experimental elements, including "Esto también pasará" (2019) and "Nunca bastó con rezar" (2025), with their 2024 compilation "Magia Subversiva Metálica" issued on double CD by Paragon Records.

Hess is a traditional heavy metal band from Rosario, Argentina led by vocalist Melani Hess, who originally formed the project in 2010 as a tribute to classic acts such as Black Sabbath, Iron Maiden, and Judas Priest. The band released their debut album "Hagalaz" in October 2014, followed by the full-length "Harpokrates" in 2019, with the current lineup also featuring guitarist Ariel Schefer and lead guitarist Diego Schmidhalter.

Heterodoxa is a thrash/death metal and crossover band from Junín de los Andes, Neuquén, formed in 2015 by members known as Mati, Bruno, Jano, and Tincho. The band released a self-titled debut in February 2015 and followed it with the EP "La Tierra Esta en Crisis" in April 2019, both independently released.

Heulend Horn is a one-man epic Viking/black metal project from Buenos Aires, with all instruments performed and composed by Friedrich Curwenius since 2003. The project's discography includes the debut "The Saga of the Draugr" (2003), the concept album "From the Caucasus to Gotland" (2006) released via Furias Records, and "Fragments from the 13th Century" (2013), all drawing on Viking mythology and medieval history.

Hevilan is a heavy/symphonic metal band from São Paulo, Brazil, founded by guitarist Johnny Moraes. Their debut album The End of Time was released in 2013 in Brazil and Japan, and later picked up by Massacre Records for a European release in 2015, earning the band spots opening for Masterplan and Edu Falaschi. A second full-length, Symphony of Good and Evil, followed in 2021.

Hevnoraak is a Brazilian doom/death metal project formed in 2019. Their debut release Sinking Into Nothingness, issued on February 8, 2019, comprises three tracks — "Tangible Existence," "A Fair Death," and "Ensnared Aura (An Ode to Emptiness)" — establishing a slow, oppressive sound rooted in atmosphere and weight. A cassette edition of the release was pressed by Final Hours of Christ Productions in 2022.