Codex Immortalis
Italian
Tomo Primo: Guida agli Immortali version 4.0 dated 16 January 2020.
Tomo Secondo: Religioni di Mystara version 2.1 dated 1 December 2012.
English
Book One: Guide to the Immortals dated 6 September 2011.
Book One: Guide to the Immortals: zipped document version current as of 2 June 2022.
Book Two: Religions of Mystara.
Book Two: Religions of Mystara: zipped document version current as of 2 June 2022.