There are no obstacles on Salvos's path apart from the occasional monster spawned to challenge him. There is nothing to see as far as the eye can see throughout the Arena. One wouldn't know that this arena used to be a forest. The arena used to have tall, giant, thick, and strong trees but they all disappeared from the arena because of Salvos' fights.
For all their colossal size, thickness, and strength, it didn't save them from their ashy fate. Trees, no matter how overgrown, are very good kindling material. Those trees are now present in the form of soot that is being blown in the wind and ashes that form with smoke to create large smog clouds in the sky.
