As a long time hardcore Ihsahn fan, I first came to know Leprous through Ihsahn (specifically since Einar sings backing vocals on several of Ihsahn's songs such as Arrival in 2012 and Celestial Violence in 2016 and also because when I checked out their live videos, I found that Leprous was Ihsahn's live touring band), but when I checked out their albums, I slowly went down the rabbit hole until I ended up owning every single one of their albums. The newest album is very good, but almost more "progressive rock" than "'progressive metal," but I think I prefer their more metal albums such as Bilateral, Coal, and The Congregation.
Perhaps my favorite Leprous song of them all (especially the outro to this song):
though this too is one of their best (again, especially the outro):
And of their newest album, I think this is the best song: