So yes. I am a fan.
I thought I would look into some products that feature Lilith in one form or another. Tonight I will start with a 5e version of her.
Lilith, Demonqueen of Vampires Boss Stats (5E)
PDF. 7 pages. 1 cover. 1 OGL. 5 pages of content.
This is pretty much what it says on the cover. We get some background on Lilith, altered to fit D&D.
Included are a CR 5 monster, Spawn of Lilith, and Lilith herself a CR 25 Medium Undead Fiend.
There are details about her lair and tactics. There are some adventure hooks added as well.
For just under $2 not a bad deal at all.
The OGL statement does not indicate how much of this document is Open or PI.
Not at all bad if you want/need a quick Boss-Level demon to fight.