Eric Halpern (Destiny's End, Z-Lot-Z) contributed additional lead guitars to the new album. Co-produced by Roberts and Gayer and mixed by Jacob Hansen at Hansen Studios in Ribe, Denmark, World Asylum was released in the spring of 2006 to great reviews and Leatherwolf played the Bang Your Head!!! festival in Germany in June, with Paul Carman back in the fold on bass for the occasion. The band also shot a promotional video for the song "Behind The Gun" with director Karpis Maksudian. Former Leatherwolf (Hail Mary and Shotgun Messiah ) member Patrick Guyton took over on bass for the band's ProgPower USA festival appearance in Atlanta, Georgia, in late 2006. Guyton has remained as full time bassist to date. Reunion with Michael Olivieri, New World Asylum and Kill the Hunted (2007–present) Original members Carey Howe and Michael Olivieri returned in 2007 and Leatherwolf re-issued World Asylum with Olivieri's vocals in place of Wade Black as New World Asylum, again mixed by Hansen. In the fall of 2007, Leatherwolf embarked on a short European tour, highlighted by a headline appearance at the 9th edition of Germany's Keep It True festival. Guitarist Geoff Gayer was let go at the end of the trip and replaced by Greg Erba with whom the band lensed a video clip for "Dr. Wicked (Rx O.D.)", with Karpis Maksudian at the helm once again. It would be included on the Monsters of Metal Vol. 6 video compilation by Nuclear Blast. By mid-2009, Leatherwolf were said to be writing for a new studio album and shared a bill with Anthrax, Saxon, Overkill, Anvil, and Metal Church at the third annual Rocklahoma festival on July 9, 2009. Michael Olivieri's solo album, Goodbye Rain, was released in December 2009. In early December 2013, the band announced the release of their Unchained Live album, the first to feature the new guitar duo of Rob Math and Greg Erba. In late May 2015, former members Carey Howe, Geoff Gayer and Wade Black announced that they were working on a new Leatherwolf studio album for a late fall release. Drummer Dean Roberts and vocalist/guitarist Michael Olivieri, original members of the band's current line-up, countered by issuing a statement laying claim to sole legal ownership of the name Leatherwolf. Howe and Gayer eventually settled on the name Haunt of Jackals and released their debut album, The Chosen, in January 2017 which also included Patrick