You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "D6 Adventure is a generic role-playing game system based on a system named after what?" whose answer is 6-sided die.
Each document should contain about 30 words, and these documents should contain useful information.

Query: origin of D6 Adventure system name
Useful Output:

Doc 1: The rules would later be expanded and applied to WEG's later popular Star Wars RPG, and become known as the D6 System. The Ghostbusters
Doc 2: This is written for the d6 Space system. That system is similar to the original WEG Star Wars system, but with a few different rules variants.
Doc 3: West End Games' Star Wars: The Roleplaying Game used and uses the D6 System (the modern version of which is known today as the OpenD6 System).
Doc 4:  D6 Legends, which is a different, though related, system from the SW system or the later non-licensed Adventure/Fantasy/Space games. The
Doc 5: The D6 System. is a fast and simple generic role-playing game system designed by West End Games for several licensed games.