of Atlantis not only looked for a replacement for a singer, but also wrote the material for the fourth album. The band advertised on their website the position for a female vocalist for several months, and on 3 September 2008, they finally announced that they had found a new female singer; however, her identity was not revealed until 1 February 2009, as the 20-year-old Austrian soprano vocalist Joanna Nieniewska. On 29 July 2009, VoA announced that because of health problems, Joanna Nieniewska is no longer in the band but will continue to support VoA behind the scenes. The band announced the replacement vocalist, Maxi Nil from Greece, and was also known for her work with On Thorns I Lay, guest with Moonspell and her former band Elysion. Delta and Maria Magdalena EP (2010–2011) On 3 December 2010, VoA announced the new title of their 4th studio album Delta which was released on 25 February 2011 worldwide. On 18 July 2011, bass player Mario Lochert left the band due to crucial internal differences. In a recent interview Harb said that the band is not planning on replacing him. Instead, they will continue without a bassist as a fixed band member. In August 2011, the band announced the title of their first EP Maria Magdalena. It was released on 21 October 2011. Death of Nicole Bogner and Ethera (2012–2013) On 6 January 2012, Visions of Atlantis announced on their Facebook and MySpace pages that former singer Nicole Bogner had died at the age of 27 after suffering from a severe disease over a long period of time. The band said that they were saddened to have lost their first vocalist, and expressed their gratitude to Bogner for her time with the band. On 27 January 2012, the band announced the title Ethera for their upcoming album, which was scheduled to be released in 2012. Ethera was released on 22 March 2013. It was the first album with guitarist Christian Hermsdörfer and with no official bassist. It was dedicated to Bogner's memory. Lineup changes and The Deep & the Dark (2013–2019) On 6 December 2013, Visions of Atlantis announced on their Facebook page that most of the lineup was parting ways with Visions of Atlantis, leaving the only remaining and founding member Thomas Caser on drums. This decision was mostly because of a desire from the parting members to play their own style