Sylvius the Mad wrote...
While it's entirely possible that Morrigan performed the ritual with someone else without the Warden's knowledge, if that happened then no one should die when the Archdemon is killed.
But someone does.
Or do they?
Been trying to think up an answer for this question to pose to you on this and it suddenly hit me. Yes, when you don't do it, you get the whole thing about the Ultimate Sacrifice Warden (be it player, Alistair or Loghain) being buried at Weisshaupt yada yada yada, but let's go back a couple of steps...
The whole thing was that the Warden dies because in order to contain the Archdemon the old god's soul has to basically have a vessel and in doing so it is consumed by the Warden... unless you do the Dark Ritual in which case Morrigan states it'll go into the unborn baby and it and the baby will be fine because there is enough room for the pair of them.
But what if Morrigan either doesn't know or doesn't let on that actually if you don't take the ritual then at some point in the future Ultimate Sacrifice Warden is going to wake up in their tomb in Weisshaupt and start the whole thing over again.
Or has my mind truly got warped?