I was so happy when it turned out the Marethyu was Josh. I supported that theory since the first time we saw Marethyu, in the shadowrealm he'd made that had no snakes, and the fact that he had blond hair and blue eyes. When he told the group on Danu Talis something that his father had said to him, or the man he thought was his father, had said, I was convinced.
When that was revealed, I actually put my book down, held up both hands for high fives, and then realized there wasn't anybody in the room to reciprocate.
The scene at the top of the pyramid was intense! so intense!