Mic Turner said:
Considering what the Spirit-eater is I don't know if we can make that distinction.
Sure we can. I'm going to do it right here.
MotB is a story told in two parts. The first part is the PC's story - how they became trapped in a barrow, how they became afflicted with the Spirit-Eater curse, and how they deal with it. Safiya serves as the 'narrator' for this part of the story, helping the PC to make sense of what is happening.
The second part is Akachi's story, and how he launched a Crusade and was cursed in the first place by Myrkul. But Akachi's story isn't about an idealist's crusade, it's about an attempt to rescue a single soul - it's a love story, a tragedy. The Wall is incidental. What's important is that he fought for the woman he loved, and was cursed because of it. Kaelyn is the narrator for this part of the story, but her reasons for bringing down the Wall are quite different.
Of course, these two parts of the story come together, and for the PC to save him/herself (assuming the Good path, here), the PC has to put Akachi to rest by following in his footsteps and assuming the 'role' of Akachi. He fought to take a single soul from the Wall - and that's exactly what the PC is there to do, too. As in the past, the Crusade and the Wall are incidental to events in the present. That soul could have been anywhere (a deep dungeon, a wizard's tower, the plane of Fire) and the basic shape of the story would be unchanged.
So that's what I mean when I suggest that MotB was not about the Wall and the Crusade. It features them, yes - but they are the backdrop for what is a very personal story of love, loss and a grim curse.