On 14 February 2012, Therion announced it was recording a studio album and had planned a 25th Anniversary Tour. "Les Fleurs du Mal" was released on September 28. The album is considered by Johnsson to be an "art project", which includes not only the music, but also special inlay graphics and video clips - in 2015 partly released on a limited edition DVD called "Garden Of Evil". The album consisted of covers of French chansons and pop songs that were performed in the band's style. On the release day the 25th Anniversary Tour was also started through Europe, also featuring the album's contributing keyboardist Stefan Jernståhl. Some leftover songs were released on an EP "Les Épaves" in the end of 2015.