I was sure to encounter some issues hardlining 3.5 demon knowledge to spread to the server in-character, and I feel it is necessary to post and remind people at this point: The wiki is not a source of accuracy or often even proper lore for 3.5.
There is even a 3.5 Demon Lord that is exclusively deferred to in 3.0 content on the wiki.
Meanwhile good ol Demogorgon goes from sentences about 5.0, to 3.5, to 1.0, to 3.0, to 4.0, to 2.0 and it's psychotic. Don't. Rely. On the wiki.
Use it for sources and acquire the actual 3.5 PDFs for free on the internet.
For Fiendish lore, refer to The Fiendish Codex I, and II, as well as "Demonomicon of Iggwilv" entries in the DRAGON MAGAZINE PDFs, that are often numbered in the 300s. Like Dragon #357 for the Demonomicon of Iggwilv entry on Demogorgon.
Absolutely do not confuse this with the "DEMONOMICON" FROM 4.0. THAT IS NOT 3.5 LORE.
That's all for now folks. Do you're reading; or I highly recommend you learn IC from one of the many serious ooc Dungeons and Dragons nerds in the community.
Alternatively, look forward to a series of entries by me in-game in the next few months and other locations, spreading 3.5 demonic knowledge.