Fun game but very poor server design.
Basally you play a junior who has to defend a or several crystals, depending on the map. The fighting varies depending on the class you play, this can be done by creating defence devices: traps, turrets and blockades, then using dps to mouse button bash and kill the swarms of enemies who emerge though pre-determined gates.
When the enemy are killed they drop small gems and occasionally weapons and armour . When you pick up the gems (by simply walking near them) you are given manor. The manor is used when you create a defence device (above), a weapon overcharge power-up or healing.
At the start of the game you get the choice to either chose a game to join or quick game. You either join straight in to a map or within the Inn of the games leader. This is shown by the wave indicator on the game choice selection screen.
The Inn has a shop keeper to allow you to buy and sell upgrades, with a furnace in the middle of the Inn that will also allow the selling of pick-ups and allows customisation and spending points on your skills and items you use.
Once the map is entered (by the game leader starting the game), you get build time to run around approaching chests (shown on your map) and collecting manor (you start each map with no manor), then build your defences. You also get the option to drop manor to aid other players. The build time can be unlimited or pre-determined, either way - as soon as a player clicks on a crystal (or press G) a countdown timer will start, if all player click or hit "G" the attack will instantly start. You now monitor your defences and stop (kill) the waves of enemies from attacking your crystals.
If a crystal is destroyed the game is over.
The upgrade system is simple as you can view the map and all the weapon and armour drops are shown as a dot. All the green dots are improvements, when you walk up to the item you get the option to upgrade or store. All stored items can be either given to your character or sold during the build stage or within the inn.
The major downside of this game:-
Most of the currency and achievement rewards are given at the end of the map. The servers are very un-stable and are reliant of the game leader staying on-line.
You could spend ages working though the various waves on the map to only drop out of the game near the end and loose everything.
I contacted the games designers (and as yet) they didn't bother replying.
In my opinion, any game where you can spend 10-20 minuets on a map should have a fail safe to automatically elect a new game leader to prevent the map from falling and placing you back at the start losing all of the currency and achievement rewards.