Secret Societies are simply societies that conceal their activities from outsiders. The Veiled Alliance and the Order are two major examples of secret societies on Athas. Even the Merchant Houses can be considered secret societies, in some aspects, because they hide many of their activities from others. Other secret societies can, and should, exist in your own games.
Secret Societies have ratings based upon their wealth, influence, size, and secrecy. All of these ratings, except for size, has a rating of one through twelve. One is a low rating and twelve is a high rating. The ratings may change for each of the city-states and various settlements.
The ratings are to give the dungeon master an idea of how powerful a secret society is. Although, if a dungeon master wishes, they can roll a d12, to determine if the secret society is capable of an action. For example, if a dungeon master thinks the secret society would want to hire a band of assassins, to take care of a group of meddling adventurers, the dungeon master may roll a d12 and consult the secret society's wealth rating. A roll lower than the rating is a success and the secret society is able to afford to hire the assassins.
Wealth is how much money the secret society may call upon to meet their ends.
Influence is how much pull the secret society has on the local government.
Size is the number of members and employees the secret society has. Employees may not realize that they are working for a secret society.
Secrecy is how well the society remains hidden from the common people of a city-state or settlement.
Below is an example of a secret society.
Eazim Taghia
Tyrian Secret Society
Wealth: 10
Influence: 9
Size: 12 members, 32 employees.
Secrecy: 10