Rule 2; Items
Because of how the players were careless when giving the refuges healing crystals, they are no longer allowed to just give them away anymore.
As such the players and the Infected as well as anyone that wants a healing crystal has to enter Aincrad to get one.
Aincrad informs everyone that it can track anything that belongs to it anywhere, so if a person were to take a weapon or any tool belonging to it, Aincrad will make sure to retrieve the item that was stolen.
As such, any healing crystals taken from it must be used by the person that has earned them before leaving the castle.
If the person has a loved one such as family and friends that are not anywhere near Aincrad at the moment, then Aincrad will allow the item to leave with the person as long as the item is used once person A and person B meet.
The weapons- potions- tools- and crystals are separate from anything that is sold to the outside world and as such are considered things that aren't allowed to be sold.
If an item is stolen and is not immediately used to heal a person, then a retrieval team will be sent to recover the stolen item.
The teams are allowed to kill everyone and everything in the immediate area to secure that both the item and the thief are brought back to Aincrad.
The person that stole the item is immediately given the position of a player and made to climb the castle as they were brave enough to steal something from the castle and as ouch found worthy of climbing the castle.
If the person surrenders, they are allowed to bring back their families to live within the castle as none combatants, this is allowed because his or her parents were able to breed a child with enough guts to try and do such a thing.
Please remember that all Players are considered Items belonging to Aincrad and if they are taken from the castle by force, then the castle will send stronger teams to retrieve them.
Rule3; People
I will say this now, Civilians and Players are not to consider anyone outside of Aincrad as people.
There are three kinds of people Civilians who can be found living inside of Aincrad, within the various cities and towns, farming- minings, and performing everyday duties to help maintain everyone's everyday life.
The same goes for those that are living outside of the castle as they are either mining minerals that don't exist within Aincrad, trading with people from the various kingdoms, or restoring whatever objects they run into.
The various monsters and Floor Bosses can be considered people but only those that can communicate with the players.
For example, if a dragon can only roar, then they aren't people and should be treated like an animal that can be eaten.
If the same dragon can talk then it's a person that depending on the situation will be allowed to live.
Anyone or anything that attacks the castle dies without exception.
Because of the conflict between each kingdom Aincrad has deemed itself to remain separate from the world and as such, it has no allies.
It has chosen this because if it chose a side regardless of who it is, then it would only increase the number of enemies.
If one questions Aincrads decision, simply look at the number of organizations both public and secret to understand why none of them can be allowed to get into the castle and gain its secrets.