Correction to the horse trick: The only western wall porous enough for a horse to fit through is behind the Commoner’s camp. And another trick!
When neutral or better with the opposing faction and doing the repeatable quest "What is that smell" in the Jungle, meeting the criteria for one quest will mark both as completed. Looting glands for the Alliance quest counts as kills for the Dark Runner quest, making it extremely easy to get the 7 kills from the group of 4 behemoth just south of the camps. You can also turn them both in to a single quest-giver, oddly enough... Even more odd is, after completing both, the first quest you turn in will always be for the opposition's quest. So after turning in one, you can simply walk to the next screen, accept the quest again, and turn it in again. Over and over and over, getting reputation and 27/32 tokens a pop. And boots, if you like boots.
Your horse is awesome. More than once, you're going to find yourself in a tree or rock or wall thanks to its amazing teleportation-like speed. Its truly unbelievable ability awaits in Varz: your horse can literally run straight through most of the barrier walls and explore the outsides of the map, and even the curious black square in the bottom right. The world map only extends one square north; going east, south, or west(I'm assuming) will result in a black screen of death requiring a reload. To get above Varz, just go one square south of the northern wall and run due north. If you go to the westernmost tip of Varz, you will wind up in the wall of the Voidbringer. To get out between the worlds, run south along the west wall. Just after entering a new square, hold down + left to glide at an angle straight through the barrier. Every square outside of the current map is just a plain of grass with nothing, with the exception of Voidbringer's room and the ice dragon's cave.
In Varz, after accepting both end storyline quests thanks to being Ally status with both of them, I was only able to complete the Alliance's final quest. The Dark Runner associate never spawned. After defeating the Voidbringer and starting the game again, I was greeted by a Darkrunner quest ensuring me that thanks to my efforts we had taken over the world. So even if you do all the work as a good guy, evil still wins.