departure from previous sounds, most notably with the inclusion of sharp dynamic shifts, and Bjørnson considers the former a turning point for the band. Following Ruun, in 2007–2008, Bjørnson, Kjellson, and Isdal collaborated with the Norwegian noise duo Fe-Mail under the name Trinacria. International recognition Enslaved released the album Vertebrae in September 2008, their tenth studio album and their first on Nuclear Blast. Terrorizer Magazine named it the album of the year in 2008, notably above other metal releases such as Meshuggah's obZen and Opeth's Watershed. After touring Europe extensively, Enslaved embarked on a North American tour with the progressive death metal band Opeth in May 2009. The album is noted for its shift in its approach and its diverse sounds; Sammy O'Hagar from MetalSucks.net even says that "to call [Vertebrae] black metal would be quite a stretch" because "there's an impressive depth to [it] that surpasses the sour misanthropy so often (and rightfully) associated with the genre", and furthermore describing their sound as "heavy and surprisingly soft, focused and curious, true to their roots and longing to forget them". The album's sound has been said to be akin to Pink Floyd's sound on a few occasions, as well as other black metal releases in a similar vein. Enslaved released their eleventh studio album, Axioma Ethica Odini, on 27 September 2010 in Europe and the following day in North America. In 2011 Enslaved released two new EPs. The first EP, entitled The Sleeping Gods, which was produced in partnership with Scion Audio/Visual, was released on 10 May 2011 and made available as a free download consisting of 5 original tracks. The second EP, entitled Thorn, was released on 27 August 2011 in partnership with Soulseller Records in fulfillment of a decade-old agreement. The Thorn EP, released on seven-inch vinyl, was strictly limited to 1,000 copies and featured a more atmospheric sound than the band is currently known for. Enslaved started their 20th anniversary tour "Circling Above and Within North America Tour Part IV" in September 2011 with Alcest and Junius in the United States and Canada. An official tribute album called Önd – A Tribute was released on Pictonian Records in July 2012. It contains twenty covers from twenty bands (including Dordeduh, Fen, Kraków, Vreid and Wodensthrone) to celebrate the two first decades of Enslaved's career. After having signed to Nuclear Blast in Europe, too, Enslaved released their 12th studio