The EP's musical style is a mix of the band's signature sludge metal sound and grunge artists such as Alice in Chains.

A CD-format compilation album title Ceremonies of Consolidation released through Gilead Media will include all three pre-Magus EPs (The House Primordial, Inconsolable and Rhea Sylvia).

Several critics lauded Thou's incorporation of grunge music into their sound, Bryan Funck's vocal range, and the band's sonic experimentation that diversifies their existing and expansive discography.

[8][9] In Paul Simon's review for Allmusic, he concluded: "Rhea Sylvia is one of Thou's more accessible offerings, but it's no less boundary-pushing, and it makes a welcome, fitting addition to the group's catalog.

"[8] In Kevin Stewart-Panko's review for Metal Injection, he said: "In lieu of a proper grunge revival—which will likely, or hopefully, never happens—Rhea Sylvia offers not only an expansion of the blueprint but also shows just how deep Thou’s capacity for diversity runs.