First Key of Chaos spoiler
The First Key of Chaos is not generated in the dungeon. Instead, it can be created by naming a standard skeleton key "(The) First Key of Chaos". Chaotic characters can do this at any time, characters of other alignments must generate Chaos, the last boss of the Chaos quest, before they can create this key. Technically, only the Third Key of Chaos needs to be generated, so a bones file will work as well.