Shemeska
Adventurer
Flexor the Mighty! said:Ditto on the renaming stuff and the blood war.
That existed before Planescape. Baatezu and Tanar'ri first appear in a pre-Planescape 2e book (Monstrous Compendium: Outer Planes Appendix) as well as the idea of the Blood War.
Planescape was handed that and took what was originally a pretty shifty reasoning for the changes and made them into something bloody brilliantly inspired in how they developed them.