looking for an original dnd game

[Bahumuth]

It really isn't that heavily modified. The biggest changes are I added multi/dual classing, thieves get d6 hit points and can divide the points for their thief abilities how they like, and halflings get extra thief points. And really the only ones who are multi-classed are PCs.

http://bahumuth.chaosnet.org/dnd/Rules.html