After the release of their first album Enter, the band became prominent in the Dutch underground scene. It was not until 2001 that they became known to the general public, with the single "Ice Queen" from the album Mother Earth, which reached No. 2 on the Dutch charts. Since then, the band won the Conamus Exportprijs four years in a row. Their next albums The Silent Force and The Heart of Everything debuted at No. 1 on the Dutch charts. In 2008, they released a live DVD and CD, Black Symphony, recorded with the Metropole Orchestra. This collection was followed in 2009 with An Acoustic Night at the Theatre.
The band's fifth studio album The Unforgiving, was released in March 2011, alongside both a comic book series and a series of short films that together encompass a story. The first single, "Faster", was released on January 21, and the first short film, Mother Maiden, was released on January 31. The band has sold more than 3 million copies worldwide.
On 13 November 2012, they celebrated their 15th year birthday with a huge live event, called Elements, at the Sportpaleis, Antwerpen.
Their sixth studio album, Hydra, was released on January 22, 2014 in Japan, January 31, 2014 in Europe, and February 4, 2014 in the United States. The album features guest appearances from Tarja Turunen, who appears in the lead single "Paradise (What About Us?)", Howard Jones of Killswitch Engage, Dave Pirner of Soul Asylum and American rapper Xzibit.
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