In that case, don't do the reformation part. Instead, let's start controlling all the sand and dust around it and impaling this bastart with high-speed sandstone spikes.
EDIT: Of course, any reformation would have required that, too... that, or metal spikes. But I don't think that there's much metal around.
Your soul and spirt are inside the wolf.
You cannot affect things outside the wolf.
More specifficaly, you'll probably be in the foot of the wolf. And the only way to truly kill it from the inside would be to destroy it's brain, because that's the only place Dicey couldn't touch to much because of the risk of driving the wolf insane. Everywhere else? She'll probably attack you.
Edit: Oooh wait, do you think I mean you would reform in you full size in the wolf? Because you actually wouldn't, you'll obviously be alot smaller. I mean, how else would Dux be able to some of the insides of Luckster(The Wolf)'s head?
Edit 2: Jesus christ I am butchering the English language so much today.
I'm not quite sure how you plan on resizing a spirit. My impression is more that of intersection.
I get the impression that we have different ideas on how spirits work.
And why wouldn't he be able to affect things outside of the wolf? Even if, say, the wolf was a large building, and he was in the foot, and there was a large desert outside, he'd still be able to control the sand in the desert and cause large sandstone spikes to puncture through the whole thing.
Also, a rundown on my understanding and perspective:
I created tBM (aka Aaron Blaez, aka the Chroniqler) to make a story around.
A story where somebody who is completely immortal, and has abilities that should by all rights mean that they are the most powerful entity in a given existence (barring anyone with omnipotence/omniscience/etc.), but prefers not to deal with any of that, and tries to avoid killing anyone.
A story where he has to deal with being dead and immortal (and the fact that they are essentially equivalent), and the endless tedium that comes with that.
A story that takes other stories' settings and drops Aaron into the middle of them, forcing him to try to put everything back on track because he
really doesn't feel like getting the headache of changing someone else's stories.
A story where the fourth wall is essentially non-existent, but only for Aaron and the other Wanderers that I made to be with him.
And most importantly, a story where one of the primary issues is that Aaron is able to pick and choose which laws of reality he follows, whether he will abide by this realm's rules or by another, and his magics, sciences, and abilities are completely out of context to everyone else there.
He has been from Alderaan to the Shire, visited Hogwarts and the XCOM HQ, fought off hordes of demons and aliens, and so on and so forth. And unless the story is already broken beyond repair by forces beyond his control - that is, by myself, aka the Redwing Chronicler, writer of his tales and creator of the plot - he will do all in his power to make the stories go as closely to how they originally did as they can.
I get the impression that it doesn't really mesh with the basic structure of an RTD very well.