Way too much comma splicing there, buddy. You could use periods.

Ex:

"I relaxed my posture as I opened the door into the Hound Pits pub, having just killed the wrongfully-placed Lord Regent, I had only six standard Crossbow Bolts, two Grenades, a Springrazor, and my folding blade, made by Piero with masterful craftsmanship, I was not, however, tired, the adrenaline rush from infiltrating Dunwall Tower and fighting my way out still carried with me, I met with the Loyalists, all drinks in hand, and Emily happily drawing in the background, it put a smile on my face, throughout all the death I had caused, to see that it kept Emily safe and her rightful place closer was reason enough to fight for it.

Should be:

"I relaxed my postured as I opened the door to the Hound Pits Pub. (Insert description of events). I was not tired from the adrenaline rush from infiltrating Dunwall Tower, and the fight still ran through me. I met with the Loyalists, all with drinks in hand. Emily was drawing happily in the background, and it put a smile on my face. Despite all the things I had done; the things I have changed, I was elated to see that it kept my charge safe and pave way for her rightful place on the throne."

The rest? I'll leave that up to you.

I was wondering if I was the only one thinking that.
"Don't drink it, man. The game was way too short to end now and those loyalists are awfully suspicious.I bet that thing is poisoned. Don't drink it. Nonononononono - Dammit, Corvo! Now you'll have to come back to hunt down and kill every one of them!"

You know, I always wondered why Corvo, as a the bodyguard to the Empress, didn't recognize the poison until too late, and that when he finally did, he didn't just kill these people. I was contemplating writing my own one-shot where this happens, so I was quite thrilled to see that someone else thinks the same!

Brilliant! If only this could have happened in the game...