This story is a sequel to Headless, not Heartless

Okay, taking it from the top.
Hi, I'm Auric Fulcrum, also known as Frank DeFontaine. For about 1,500 years, I wasn't alive. I instead inhabited my Dullahan costume as a spirit because of my sword, which also brought me to Equestria. Once I got here, after a few years of back and forth, Sunbutt imprisoned me because of a minor misunderstanding.
I heard that!
You were meant to!
Anyways, once I got out, I learned that the Wise One was coming to this reality, so I did what came natural to me.
I sought out the power of the Golden Sun and used it to defeat him so utterly I would never have to worry about him again.
Problem was, the energies that bound me together and the power of the Sun conflicted, so my armor fell apart. And without the armor, I was unbound, unfocused.
I came to a week later in the same basement I had been imprisoned, in my old body, but with a few...upgrades. Like Alchemy being a Thing I can Do.
Now that I'm alive again, my to-do list is radically different, but no less daunting.
For starters, how am I supposed to stop a mountain from sinking into the earth?!