Woldlaw

Archfae are powerful in any arena, but in their own realm their capabilities are godlike. The will and the word of the archfae defines reality of their Faewold. The topology and contents of the wold are shaped to conform to the Archfae's conscious and subconscious wishes and expectations, and the very laws of reality can bend to their declarations.
The laws of the wold are set by the archfae and they are absolute. Most of these laws do require enforcement, but some number are capable of simply binding the nature of reality when spoken. A faewold will typically be able to sustain no more than three, five or seven greater laws - and any more than three is highly unsual - and five, seven or eleven 'whimsies', or lesser laws, depending on the strength of the archfae in question. The numbers are always primes, with the number of whimsies always the next prime up from the number of laws.
Whimsies are the often arbitrary stylistic and aesthetic rules of the wold. If the archfae declares that, in their realm, no colour shall exist, all things in the realm appear in black and white. If it is ruled that all sentient beings shall wear red hats, it is so. Those entering the wold improperly attired to meet a mere rule may be prosecuted, those violating a whimsy will find, for example, their headgear transformed accordingly, or a hat simply appearing on their head. A whimsy may change the form of an individuals goods or apparel, but not its function. a breastplate transformed into a mantatory silk blouse will still offer the protection of a breastplate.
Greater laws, however, are impermeable dictates that are used to secure the archfae's rule. Woldlaws of this kind must be specific and limited - it is not possible to simply declare oneself immune to harm, for example - but at least some of an archfae's woldlaw almost invariably guards against a specific and immediate perceived threat - forbidding the bearing of swords (in which case any such blade may become too heavy to carry, or simply transform into something else when within the wold,) or declaring that spears may not pierce the flesh of the wielder's social betters. Other laws may reserve particular powers for the archfae and their servants - flight or invisibility are commonly ringfenced in this way.