Same boat as you, Exuvia was my intro to Ruins of Beverast and man, it's like the soundtrack to an acid trip that took a dark turn. They're a band I'd heard about for years but never checked out til recently, which album do you suggest next from the back catalogue? Rain on the Impure or whatever is the one I heard about the most from other people.
Rain Upon the Impure is probably the most exalted album and with good reason, it is phenomenal. On the last page I posted the youtube link for the full LP edition, which was a re-master and includes a bonus track. It's a bit more accessible than the original CD version, with clearer percussion that really helps you feel the frantic nature of the music. The CD version does seem to capture some of the more chilling, off-kilter parts better, but at times it's annoyingly muddled. Both are available on youtube.
I also posted
Blood Vaults and
Foulest Semen of a Sheltered Elite (awful title, I know), which are both great too, perhaps a bit more "concept album"-like. I didn't post the debut album,
Unlock the Shrine, but that is also definitely worth a listen; it's a bit more psychedelic and less claustrophobic than later albums.
I'd probably look at
Rain first, but it does maybe need a few listens before it really catches on.
Blood Vaults is maybe the most accessible, with a very clear and doom-heavy sound.