[10] The album features two guest guitar soloists: Jørn Viggo Lofstad of Pagan's Mind (described as a "good friend of the band and one of the best players to ever come out of Norway") on "Relentless”, and Simone Mularoni of DGM on “The Sentinel”.

Metal Storm gave a highly positive review, calling the album "timeless, yearning, nostalgic, and burning like a fire on the shoreline's edge that doesn't quit no matter how hard the waves crash", and concluding with "Mature in every way possible, yet with the enthusiasm of youthful hope and the biting mark of inner angst to keep us alive, Triosphere tears down the walls that so many would live eternally in.

Ida Haukland’s lyrical content feels like poetry; her voice powerful and emotive, adds depth and magic to every track.

[3] Metal Underground called the songwriting of The Heart of the Matter"fantastic" and "epic", and said it contained "some of the best riffs of the year", giving the album 4.5 out of 5.

The review was concluded by "an album with nothing to complain about and everything to get excited by, The Heart of the Matter is a beautiful, aggressive, elegantly chaotic masterpiece."