IIRA is a one-man experimental black metal project from Caracas, Venezuela, launched in 2022. The project's debut "Demo" — released on cassette by Deathprayer Records alongside a digital edition — consists of three lengthy instrumental tracks running over 26 minutes and has drawn praise for its idiosyncratic approach, shifting melodies, and atmospheric depth. Cover art for the release is taken from Venezuelan painter Cristóbal Rojas's work "La miseria."

Ilizarov is a death/thrash metal band from Formosa, Goiás, Brazil, founded in mid-2014 by Danilo Rocha (guitar/vocals), Nel Dias (bass), and Veto (drums). Drawing on old-school death metal, punk, and rock and roll, the band has remained active in the Brazilian underground and released the album "Heal and Kill" in March 2025.

Ill Reasoning is an extreme metal band from Concepción, Chile, formed with the intent to create direct, riff-driven music described by the band as a "sonic apocalypse." They released their self-titled debut EP on January 23, 2022 — four tracks recorded and mixed at Neolitic Studios in Concepción and mastered at 15Hz Studios in Santiago — followed by the single "Immolation" in 2023.

Iluna Perpetua is a melodic blackened death metal band from Belo Horizonte, Brazil, formed in 2021 and featuring members Marcelo Murrer, Rafael Mordente, and R. Tamietti. The band debuted with the seven-track album "Awake at the Deep End" in July 2022, drawing praise for combining technical accomplishment with the raw, reverb-heavy atmosphere of the city's extreme metal tradition.

Imflawed is a groove/thrash metal band from Recife, Pernambuco, Brazil, formed in 2019 and comprising Arthur Santos (guitar/vocals), Jefte Felipe (lead guitar), Alisson Nascimento (bass/vocals), and Paulo Henrique (drums). The band released the live album "Live at Hellcife" in April 2021, recorded at L.A. Studios in Recife and featuring a tribute to local legends Chico Science e Nação Zumbi woven into the set.

Immemoriam is a melodic doom/death metal band founded in 2017 in Cali, Colombia, by original members of local act Nameless. The lineup was completed in 2018 with Demolt on drums (ex-Misty Fate, ex-Liturgia), Jaime G. on vocals (Dissention), and William T. on keyboards (Alpha Cygni), and the band has released the singles Arrival (2018) and Prey of Oblivion (2019).

Imminent Doom is a black/thrash metal band from Rio de Janeiro, Brazil, formed in 2016. The band released their debut EP "Guerra Iminente" in October 2016, followed by the album "Ataque!" in December 2020. Their sound draws on the aggressive traditions of Brazilian black and thrash metal, delivered with raw, independent production.

Imminentchaos is a crossover metal band from Santo André, São Paulo, Brazil, active since 2006. The band released the album "Days of Disgust", recorded and mixed at Da Tribo Studios in São Paulo and mastered by Alan Douches at West West Side Music in New York, demonstrating a polished underground approach rare for the local scene. Their catalog, released through Terceiro Mundo Chaos Discos, blends metal aggression with hardcore energy.

Immortuos is a death metal band from Marília, São Paulo, Brazil, formed around 2012 by guitarist and vocalist Jabah Contardi, bassist Rogério Pereira, and drummer João Moreira. The trio released the demo "Infanticídio" in 2012 and followed it with the album "Estágio Terminal" in 2014. The band has been on hold since the mid-2010s, leaving behind a compact but focused body of work rooted in old-school death metal.