Hussar
Legend
I want it. I would buy it. And I don't mean "I want it in a single tome".
I see it as a tool to play old 1-2-3-4e adventures.
1)The only important things would be:
- Every single monster ever created.
- creatures ordered by name.
2) some nice add-on would be
- Appendix with index of past adventures listing all creatures appearing in each one
- maybe collector binder format (I don't know if I explained myself well - sorry for my English - I mean like the one of 2e, where you could add "sheets" with new monsters)
I hate when I can't figure where monsters are (mm1 or fiend folio? No wait, it was in the eberron monster manual! Or it was some adventure appendix? Nevermind I will create my version of this creature)
I think an electronic version would be much more practical.
But I loved those encyclopedia magica they released at the end of 2e. A monster version would be so, so sweet.