Monster Play: Two PvE factions, with a twist of Three PvP factions

The Reckoning Online, features a unique Monster Gameplay mode.

Players from the Vanguard and Legion, can be summmoned to control creatures of evil, and reck havoc on the two factions in a massive three faction war in the persistent world.

Each player can create a monster character that the player can join on at any time in the world.

But there will also be unique monsters throughout the world that players can mount the controls for. Some of these monsters, may be a giant boss creature of madness and destruction.

Some units may be lesser bosses, with minion army units guarding them, which are also under the player's control.

PvE is handled in another format. The PvE instances are grouped by traditional faction only grouping.
But some world fights, can be controlled by players in monster mode, who acts as a dungeon master in a traditional Table Top RPG. They may be given a more RTS view point for directing monster units, or they can be in the third person view, to control the monster individually.

What's more challeging, than a Monster, with the intelligence of a player?