
Originally Posted by
Pebe
Plan C is much more extreme than Plan B, you know that right?
Plan B: Kill one guy and end it all
Plan C: Summon the manifestation of the 12 gods, draining the majority of the aether from the planet, and potentially ruining the future of Eorzea.
In comparison, Plan B = assassination, Plan C = nuclear war. I pretty sure Lousioux mentions the consequences of summoning the twelve Gods, but i don't remember where, I think perhaps in Living on a Prayer.

Originally Posted by
Kallera
It should be mentioned that said ruination by the Twelve is due to the nature of summoning them in this realm, that their intentions(good or ill) are not even factored in this mess only heightens the desperation of this plan. But the stakes are higher still. That Eorzea have any future at all from Dalamud's descent, that some or our lives and livelihood survive.
We will lose much of our lives, and for some their entirety, here before this is over.

Originally Posted by
Orophin
Doesn't Plan C seem more of a last effort type of thing? I mean it makes sense to me.
Here is what Louisoix says before and after you accept Living on a Prayer:
Louisoix: My dear Master. It does my spirit well to see you again, and none the worse for your encounter with Nael van Darnus.
Louisoix: When you accompanied Master Garlond to the floating isle, you could not have known what awaited you there, nor whether you would ever return, yet thither you went, to spare Eorzea her doom...
Louisoix: Your triumph should rightly have marked the end of this tale...alas, the fates are not so kind. Though it grieves me to say the words, the red moon of Allag...continues its descent.
Louisoix: Following Nael van Darnus's defeat, we of the Circle of Knowing maintained our vigil over Dalamud.
Louisoix: It took us but a little time to deduce that all was not as it should be...and rather longer to confirm our findings beyond a doubt...
Louisoix: Did the blow that felled the White Raven come too late? Or is there another force that works to bring down Dalamud?
Louisoix: Whatever the answer may be, one thing is plain: the threat of the Seventh Umbral Era yet looms nigh.
Louisoix: Master. No man living could doubt your worth.
Louisoix: Eorzea has peered over the precipice countless times, yet ever were you there to draw her back from the brink.
Louisoix: Now, you must needs do so again. Heed me well, for I would entrust you with one final mission.
Louisoix: I would have you become the beacon to summon forth the Twelve─aye, the guardian deities of Eorzea.
Louisoix: Nophica, the Matron; Althyk, the Keeper; Byregot, the Builder; Rhalgr, the Destroyer...
Louisoix: Azeyma, the Warden; Nald'thal, the Traders; Halone, the Fury; Menphina, the Lover...
Louisoix: Oschon, the Wanderer; Llymlaen, the Navigator; Nymeia, the Spinner; and Thaliak, the Scholar─patron deity of mine own Sharlayan.
Louisoix: Faith in the Twelve is strong in this land. By channeling that faith through prayer, we should be able to call upon their aid.
Louisoix: Alas, we cannot simply pray wheresoever we please. We must needs present ourselves before the gods, at the places where they lie in slumber.
Louisoix: Mayhap you are aware that divine symbols have manifested across the land in recent days? Well, it was by mine own hand that they did so.
Louisoix: Graven upon ancient stone, these symbols are temporal representations of the Twelve. It is before these stones that we must entreat their succor via a ritual.
Louisoix: I would have you embark on a pilgrimage to each of the locations and give fervent prayer─a prayer for Eorzea's salvation.
Louisoix: In so doing, the gods shall awaken to lend us their aid. Will you do this thing, Master?
Louisoix: The light of hope shines brilliantly within you, Master.
Louisoix: No matter how deep their slumber, the gods will surely stir in the presence of such light.
Louisoix: If you would lend me your map, I shall mark thereupon the places whither you must go.
Louisoix: The pilgrimage will take you to the farthest reaches of the land. Steel yourself for a grueling journey, and pray exercise the utmost caution.
There is not one mention of any danger whatsoever in praying to The Twelve. With the exception of the last line in which he mentions that the journey will be grueling due to the pilgrimage taking me to the farthest reaches of the land, there is no such mention of any inherent danger in summoning the Twelve.
I don't know if somewhere along the line of completing this quest or mayhap upon completion Louisoix says "OH! I forgot to mention that all of Eorzea was at risk of being destroyed by the summoning of the Twelve" but as far as I know the three of you are making stuff up.
To put it bluntly, Louisoix engraved the symbols of the Twelve patrons of Sharlavan in various potentially sacred stones across the land and we are to pray to them in a ritual manner so that they will save our ass. Doesn't this seem a lot easier and less risky than affronting the lunatic who has the power to control the lesser moon and bring it crashing down on our planet?
Last time I checked, you pray to your gods/goddesses before entering a battle not after. Logically speaking, why risk your life against Van Darnus when you could first pray to the gods for their help? You see, if you die you can't pray. May as well pray before you die.