In various versions of D&D, there's a cleric spell called "Command" where the cleric compels an enemy to obey a one-word command. Typical commands might be "sleep", "flee", "surrender", ...
In early D&D, there was the concept of an "alignment language." The original "little brown book" D&D says only: Law, Chaos and Neutrality also have common languages spoken by each ...
To add more flavor, I want to create documents written in the actual script. I remember awhile back seeing examples of the Common/Elven/Dwarven alphabets for instance, but can not recall where I can ...