Erratum: The first line of the resolutions section of this scenario should read: "If no resolution was reached and at least one investigator resigned: Proceed to Resolution 1." - FAQ, v.1.5, April 2019
Q: When the back of agenda 2 takes the place of both act and agenda decks, should I still place a doom each turn? A: Yes, you should still place 1 doom on “The Greater Good” each round. When you replace the current act and agenda with The Greater Good, it becomes both the current act and the current agenda and counts as both. (In other words, the line “this card is both the current act and the current agenda” was technically superfluous in The Devourer Below, but we kept it in order to clarify how it works; here we left it off because there was no room, but it technically works the same way.) Hope that helps!
Q: Do the basic +1 and the second +1 when you empower the blade combine for +2 ? A: Yes, the two bonuses stack, because it’s not a replacement effect (it doesn’t say ‘instead’). So regular Enchanted Blade indeed gives you +2 fight and +1 damage if you spend one of its charges.