Averno was positioned as a rival or foil to the up-and-coming tecnico Místico. Averno and Mephisto also became de facto members of Los Guerreros del Infierno, joining forces with their former rivals. In February 2005, Averno lost the NWA World Middleweight Championship to Místico as part of their long running storyline. Two months later Averno and Mephisto defeated Atlantis and Blue Panther to win the CMLL World Tag Team Championship. When Shinsuke Nakamura and Hiroshi Tanahashi from New Japan Pro-Wrestling came to CMLL, Averno initially teamed up with them, the two turned on him. This led to a trios match with Averno, Último Guerrero and Rey Bucanero defeating Nakamura, Tanahashi, and Shigeo Okumura in one of the featured bouts on the CMLL 72nd Anniversary Show. In early 2006 Averno and Mephisto were the catalyst for one of CMLL's big storylines as they defended their titles against Místico and Black Warrior twice. In the first match, they won by disqualification when Black Warrior interfered in the match after already being eliminated and in the second match Black Warrior turned on Místico, attacking his partner to end the match. In April 2006, they lost the tag team championship to Místico and Negro Casas, ending their 377-day-long reign. In 2008 Averno formed the group Los Hijos del Averno ("The Sons of Hell") alongside Mephisto and Ephesto, followed by Averno and Mephisto defeating Atlantis and Último Guerrero to win the CMLL World Tag Team Championship for a second time. On September 17, 2008 Averno defeated Negro Casas to win the CMLL World Middleweight Championship, becoming a double middleweight champion as he still held the NWA World Middleweight Championship. Their reign lasted only 38 days before Místico and Héctor Garza won the championship from them. The duo became three-time tag team champions by the end of the year as Averno and Mephisto defeated Místico and Garza on December 7, 2008. The duo's third run with the CMLL World Tag Teams Championship ended on January 16, 2009 when they lost to La Sombra and Volador Jr. On July 22, Averno lost one of his middleweight championships, the CMLL World Middleweight Championship, to Hijo del Fantasma. On July 12, 2010, at the Promociones Gutiérrez 1st Anniversary Show Averno participated in a match where 10 men put their mask on the line in a match that featured five pareja incredibles teams, with the losing team being forced to