I've got Lord of the Iron Fortress which has Steel Predators, and I know they are in the Fiend Folio, but are they in any 2e products? Is LotIF their first appearance?
They're not in the Monstrous Compendiums, Planescape Compendiums or Planes of Law (Where Acheron monsters would be). I think it's safe to say LotIF is their first appearance.
