I'm along time lurker and I've tried to find a topic that discusses what the Aiels role in the last battle will be.

 

"Till shade is gone, till water is gone, into the Shadow with teeth bared, screaming defiance with the last breath, to spit in Sightblinder’s eye on the last Day." The Aiel's purpose

 

"May you always find water and shade." A traditional blessing and farewell saying to a friend.

 

"Life is a dream from which we all must wake." The Aiel's view on mortality.

 

I've read more topics about theories about if the Dreamworld will be involved as a part of the last battle, and the Aiels believes seems to point in the same direction if you look at the above quotes...

Why not? The Heroes of the Horn will take part after Mat has blown the Horn of Valere. Hopper has told Perrin several times, that they will fight together in the Last Hunt.

I think the dead will also take part of it, because the barrier between the world of life and the world of life is already weakening. I believe, and I think I'm the only one, that the 3 to be one are the Worlds of Life, Dead and Dream.