O Artigo Inaugural do Conselho de Sábios.

Este artigo, intitulado "Filosofia por trás de regras e decisões", é escrito por Jeremy Crawford, e contém o seguinte: (ênfase adicionada)

The DM is key. Many unexpected things can happen in a D&D campaign, and no set of rules could reasonably account for every contingency. If the rules tried to do so, the game would become unplayable. An alternative would be for the rules to severely limit what characters can do, which would be counter to the open-endedness of D&D. The direction we chose for the current edition was to lay a foundation of rules that a DM could build on, and we embraced the DM’s role as the bridge between the things the rules address and the things they don’t.

O guia do mestre do calabouço

Página 4 do DMG, na página Introdução, diz o seguinte:

The Dungeon Master, DMG pg 4

[...] And as a referee, the DM interprets the rules and decides when to abide by them and when to change them.

[...]

The D&D rules help you and the other players have a good time, but the rules aren't in charge. You're the DM, and you are in charge of the game. [...] (emphasis not mine)