The Pegasus didn’t know what to say. She can feel, she can sense, she knows just how dangerous and powerful the creature in front of her is. The way everything avoided the human like a plague, his very presence is just... wrong. Like he’s not meant to be anywhere near Equestria...

Then she looked at her friends. The way they befriend him in only a matter of seconds, the way they smiled and welcomed him with open hoofs... It finally clicked to her, the one thing that starts all friendship.

“Bruce...” Fluttershy whispered suddenly. “Is it all right if I trust you?”

Bruce Gunderson: A Dimension Hopping Idiot, the Last Human, and the Protector of Equestria.

The latter title was gained when he accidentally destroyed the Elements of Harmony upon his arrival to Equestria. Considering he was known as the Harbinger of Death and Destruction a few centuries ago. It's not that much of a surprise.

To be fair, he's doing the best he can to protect his new home.

(Sequel to A Perfect World I Almost Ruined but it's possible to read separately.)

Princess Celestia nodded before lying back down on the bed. She looked up to the ceiling above her in deep thought. "The Tree of Harmony has fallen..." She took a deep breath. "Just a few hours ago I was cursed into becoming the Day Breaker." She closed her eyes and sad look slowly formed on her face. "Is it too late to achieve Peace and Harmony?"

The Changelings are allies. The SCP Foundation is getting stronger than ever. The Mane Six has grown stronger every day even more. A new embodiment of Chaos and Harmony was born and Discord will never betray Equestria since he's a father now.

Then, what kind of horrible threat looms over the horizon? Because the stronger the heroes get, the more powerful the villain will become. With the heroes having a whole army and a reality warper on their side, one would shudder to think what the villain has...

BEING REWRITTEN!!!

Here's a link

Twilight sighed. “You destroyed the Elements of Harmony...” She said with a grim expression on her face. “They are what have been keeping peace and harmony in our world.” She looked at Bruce with a dead serious expression on her face. “By destroying it, you’ve put our world in grave danger...”

When Bruce Gunderson stepped into the Land of Equestria, all he wanted was to live a nice and peaceful life. However, the word 'Bruce' and 'peaceful' aren't actually known to be used together. Proven when the very embodiment of peace and harmony shattered when he stepped into that portal.

Now, he has to take the responsibility as the Protector of Equestria for destroying the elements.
Let's just hope that the Crystallized Singularities are a powerful enough substitute...