Tribal Traditions and Commandments

The Great Dream is not the only magical force in Nurna. The same way magic and all dreams are part of a whole (the Great Spirit), so are laws and traditions. In Nurna, disobeying the tradition of your people is more than a legal tresspassing or a shameful disrespect: it is dangerous and an easy way to attract the corrupting force of the Dark One.

Manifestation

Thanks to the Great Dream, Nurna's races can understand how the world works and how the Dark One manifests. This allows them to create protection tools, which can be magical and ritual, but also mundane and common. In this last category is where traditions and commandments exist. With these tools, they avoid the corrupting forces that flow from the Dark One. Through astral travel, prophecies and the very act of communion with the gods, each tribe has created and written down its own set of rules, and with these rules they keep away the corrupting force of the Great Selfish One. These laws are more than a list of "to do and not to do": they yield power. Follow them, and you'll be safe. Disobey them, and you will fall.
These sets of magic laws can appear in two forms. Some of them have the look of customs that are passed on from generation to generation. These are known as Tribal Traditions. Other magical laws appear as religious obligations, dictated by the priests, in the name of the gods. These are called Commandments.
Every person in Nurna, whatever the race, lives under one or two Tribal Traditions, and sometimes under one Commandment too. By fulfilling them, they hope to dodge the attracting force of the the Dark One. They believe Traditions and Commandments will stop the disasters that the Dark One unleash on the world. Of course, some people do not fulfill these Traditions, and many disregard all Commandments. Many of these fools come out unscathed, but there a lot of people who end their days corrupted by the Taint of the Dark One, even without realizing it. It's very difficult to go back once the darkness of the Great Selfish One has touched you.