Obstacle

An Obstacle, also called a Rock, is a randomly generated polygon in arenas.

Design
Obstacles are gray, and have many sides, ranging from (?) to (?). They can also be as small as a Quantum Foam and bigger than a Base Protector or a EK-3.

Technical
Tanks in the branch can fly over rocks, but they take damage while doing so. Uniquely, the ammunition of and  tanks can pierce through rocks. Arena Closers and their ammunition can always pass through rocks.

Other than these exceptions, obstacles are completely impenetrable and indestructible. However, if one sticks a long enough barrel into a rock, they can shoot through the rock as it forces the bullet to go through the rock and take the shortest path out. This is very inaccurate though and essentially adds a lot of spread to your barrel.Flails and lances can poke through a rock.

Generating
The obstacles generate in specific locations in every arena. The arena 4TDM Maze does not have any rocks. Most rocks generate by the corners and on either the sides or corners of the Pentagon Nest. There is a lone rock or two halfway between each corner in all arenas with rocks. In modes with teams, the rocks are pushed further out towards the Pentagon Nest, while in Portal Domination, rocks only generate in the corners of each section.