Each power gives the player a way to bend the core rules to their advantages, typically in one of the following ways:

A set of core rules referred to as the "twelve non-negotiables" establish and maintain this environment.

In the core rules, these "rogue" classes were the thief and the bard.

It has numerous variants, but the core rules are basically the same.

Modifications to the core rules have been included in some of the more recent supplements.

There are also advantages in a county court action, even though the core rules are being harmonised.

Any rule can be changed with varying degrees of difficulty, including the core rules of the game itself.

He served as lead designer for the Fourth Edition of the core rules.

It is, in fact, the core rule of both schools: not to communicate in any way to the opposite school.

The core rules box set was released to critical acclaim in the fall of 2009.