In 2004 Alexia Lee replaced Luis Wei on keyboards and Dani Wang replaced AJ Tsai on drums. In 2005 the band released their fourth album, "Seediq Bale", which is based on the Wushe Incident. In addition to symphonic black metal mixed with Taiwanese elements, "Seediq Bale" featured increased use of erhu, blast beats, and female vocals (including a guest appearance by pop singer Sandee Chan). The album was released in Mandarin Chinese and English versions, with both integrating some Seediq and Japanese lyrics. This album also supported donations for the movie project "Seediq Bale" directed by Wei Te-sheng, who in turn donated the film's trailer for Chthonic's use in the music video for "Quasi Putrefaction."