For returning MGiE readers: This story is at the end of Moss's arcs. He's had his adventures. His magic has evolved and grown. The story will not be an exact spiritual successor to the others involving Moss. The story will go in a somewhat different direction and will likely have an effect similar to the Star Wars prequel trilogy had compared to the original. It was Star Wars, but "not the same" Star Wars.
For new readers: This is the 4th in a series that originally had 3 main installments planned with lots of details I won't be covering. It's a DnD 5e crossover with a four way multiclass and all the convoluted mechanics involved that can't be fully summarized to get you going. Read without reading the others if you want, but do so at your own risk.

He was forced into a war to protect Equestria and the world of Equis on the whole. The land was protected. Years went by. Promises were made, and promises were kept.
A spirit-turned-owl he first hated grew to be his best friend over the years as he spent his time stuck on Equis. The owl was always straightforward with him when he asked something. Only one minor item did the owl make a point to beg him not to force the owl to tell when it came up. It was not a big deal to him, as he understood it was for a promise to a lost love. Some secret the owl wished to take to his grave, he was certain. What he didn't expect was how much it would end up involving him and how much more it would end up explaining.

(As always, happy to send Hero Forge some foot traffic by showing how far their miniature customization has grown since I found them, linked in picture source)