Fortress

The Fortress is the hub for your heroes. Fortress level determines how many heroes you may have summoned at one time, the exp gained via training, and how many heroes can train at once.There are 5 tabs: Equipment, Skills, Attributes, Training, and Experience.

Equipment is the opening tab for the fortress. From here a player can equip their heroes either manually or via the "best build" button by the belt slot, upgrade heroes (gives extra attribute points) if they have enough Essences (or gems/tears for the main hero), see the stats of the character, and dismiss heroes.

The Skills tab is where a player may upgrade a hero's main two skills and alter a hero's passive abilities. As a hero's base skill is raised, the max damage the hero may deal is raised as well as gaining a larger attack area at the highest ranks.

The Attributes tab is where a player may randomly or manually train a hero's attributes. Strength = +4 phys dam/point; Intelligence = +4 mag dam/point; Agility = who acts in what order; Stamina = +16 hp/point. The cost for randomly training is 50 honor and spends 5 points. If you do not like the random distribution, you may choose not to accept it. The cost for manually training is 100 gold and spends ALL points (including ones previously distributed).

The Training tab allows players to train heroes for 8 hours (non-vip) or 20 hours (vip). The exp gained is determined by the fortress level (chart below) and the cost varies in silver. Please not that the VIP rank training slots DO NOT OPEN automatically. Even when a player has VIP, the player must then spend additional diamonds to unlock the VIP training slots. Slots for non-vip: 1 at start; 2 at fortress level 10; 3 at fortress level 25; and 4 at fortress level 35.

The Experience tab allows players to allot exp from dismissed heroes, journals, and holy water. The exp pool and holy water are determined by the Tavern's level.

Cost:Effect
The following are the known costs for upgrading the fortress, as well as the rewards. P.Gem refers to your primary mine (the first you unlocked). L.Gem refers to the mine on the left, M.Gem is the mine in the middle of the three, and R.Gem refers to the mine on the right. I know this may be confusing at first to read, but that's the formula.