: It's from the Myth Comic. Antero's Bestiary is some kind
: of book which is supposed to provide details on every
: species in the Myth world. There was another book
: before it that got lost, thus inspiring the scholar
: Antero, to write the bestiary.
: I don't know about Myth Adventures, but I think you're
: referring to the comic title, Tales From Myth: The
: Fallen Lords.
MythAdventures (I believe) is a web site (one fo the first actually) and it still exists (in a somewhat not-updated form). You can look at the links page on bungie.net and find it.
Hope that helps,
-Loph