1e core ... which are looking quite ragged these days.
Deities & Demi-gods, the earlier one with the deleted stuff.
Various other books from that era.
2e core , some MM expansions , Psion book ,
Planescape: Blood War, Law, Chaos, Conflict
I had an extended campaign on Archeron.
Rogue Modrons , marked Nupperibo's upgraded ,
nycaloth pup-fight losers saved , refugees of war.
Big shot was a Bone Devil with no tail, that could
pump out any 5th level spell. Co-regent was the
only Tertian that wasn't corrupted by the Orcus
thing. Became rogue as a modron "fundamentalist"
believing only the modrons untouched by Orcus
were legitimately modron(-ic). Separating the
untouched from The Source made them go rogue.
Etc ... lots of blood and guts justifiable by archeron.