Each user must choose one hero. There are ten heroes total; each team has five heroes available. If the user is on the Children of Light team, he must choose either Tank, Peacekeeper, Phoenix Ranger, Scared Blade, or Arcanist. If the user is on the Servants of Darkness team, he must choose either Legionaire, Shadowbound Construct, Hound, Necromancer, or Banshee. Heroes have four unique spells, which they learn after consistently leveling up. Once they reach the forth level, they can no longer level up. For this reason, the teams must be even if real competition can exist. Along with heroes are a small group of melee units and one range unit who are controlled by a computer player. These units are ordered to attack the enemies' base, and they respawn periodically. If you allow them to fight for a long time, a winner should emerge eventually. I did not do the math, but from the amounts of time I played this game and allowed the units to do whatever, I have observed that both sides have a 50% chance of winning on their own -- without any help from heroes.
The island has a Shrunken Ruins theme with ancient, sea worn tiles covering most of the middle, neutral area where the players meet to fight. The landscape in this case is rather beautiful and well constructed to look like a small island where the ultimate, controlled Armageddon takes place. What is rather annoying is that some of the ranged units, especially the non-hero units, do not shoot a visible missile. Instead, you see the initial explosion followed by a spontaneous effect, no missile.
Though the game can be translated as a good v.s. bad conflict, there is a different interpretation. For that reason, I'll give out only the facts. All the units on the Children of Light team are human, besides the Tank. They have many different aspirations, not all want to establish peace. The Peacekeeper is probably the only one on that team with such a huge ego. Other heroes, like the Arcanist, want to take on difficult challenges. The Tank wants vengeance, which seems to be a very evil intent for a good cause. On the flip side, the units on the Servants of Darkness team were either once human or creation of humans. They themselves are no longer human, but they are a result of corruption in humans. And some, like the Banshee, wish to serve "darkness" to receive something. So in this case, I'm not so sure if good v.s. evil is an appropriate outlook.