The basic arena had pillars added to it to add more depth to the play game of this level. Breaks up the line of sight to you opponent through out the battle. This give player that are not ranged to have a chance at get to the enemy.
The woodlands arena gives the players a different arena with a different play style. this map give the players a open field of view while still having cover for the melee character to close the distance on ranged opponents.
The Mountain Arena gives advantages to those players that can make it to the top the fastest. this gives ranged character a view of the map where melee characters get the ability to charge at any part of the map as well as giving all character types the ability to retreat to safety quickly.