Kellhus explaining Cnaüir's swazond to Esement,
But the scars, or swazond, don’t celebrate the taking of life, as everyone in the Three Seas seems to assume. They mark the … intersection, you might say, between competing lines of action, the point where one life yields its momentum to another. The fact that Cnaiür, for instance, bears the scars of many means that he walks with the momentum of many. His swazond are far more than his trophies , they’re the record of his reality. Seen through Scylvendi eyes , he’s the single stone that has become an avalanche.
I love this. Madness once said that Cnaüir's swazond could be akin to Karsa Orlong's souls he drags behind him. And this sounds an awful lot just like that. Many-blooded, indeed. A stone that has become an avalanche.
And we know that you can transfer a soul into another. The waathi doll and Seswatha are just two examples. Using Cnaüir's souls to become a God (ascend), or a walking God (Meppa) doesn't strike me as a stretch with the evidence building up on this re-read.
ETA: to clarify, I don't believe Meppa is a God. I meant that he is probably the second most powerful "sorcerer" on Earwa. So, in as much as a walking God.