This progressive unblack metal from, Norway was comprised of 3 members with the vocalist being in Extol previously. Tor is also a member of the band Mantric. They only released 2 albums before changing their name to Ganglion. Lengsel means longing in Norwegian with Stille Dualisme meaning silent dualism.
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I could be wrong, but I think Ganglion was a separate project, though it also had members of Extol and Lengsel.