Guys, that was AWESOME! Excellent writing everyone, each chapter was very cohesively written. @Matrim's Dice, a particular congratulations to you, I loved reading through your chapters!
And now for a hot take on the plot: So the ghost/wizard is obviously the recently dead Claus, right? He's been guiding Elias and Figgy on their journey for a while, he gave Figgy the molten stone that transformed into the chest (and quite possibly revived Elias as well) that contained all of the old Claus artifacts, which is exactly what Elias needed to become the real Santa Claus. I totally called it too with the whole it's-gonna-start-out-as-an-innocent-Christmas-story-but-being-the-sanderfans-we-are-we'll-change-it-to-an-epic-fantasy-novel thing. All together, it kinda made sense, though there are a lot of little inconsistencies, like the elves. As for Elias' death, I'm thinking that either Figgy is kinda mad as the other elves said or the magic of the molten stone was able to bring him back somehow. I'm going with the second one though, it makes for a happier story.