Demo/CD-r 2001 ("Into the arctic graveyard"): https://www.discogs.com/Adonais-Into-The-Ar...release/5711098
Demo/CD-r 2002 ("Frost Fetish 2002"): https://www.discogs.com/Adonais-Frost-Fetis...release/6734233
On metalarea was uploaded ony their 1st demo (released on tape in 1999), which can be found here:
Adonais - Obscurae Hiemis Mysteria [demo] (1999)
