Perrin and Lester Smith designed the Sovereign Stone RPG (1998) based on the trilogy of Sovereign Stone books, and Margaret Weis formed the company Sovereign Press with herself as CEO to publish the RPG.
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Perrin acted as an advisor for Margaret Weis on the final Star of the Guardians novel, Ghost Legion (in which he also appears as a character).
Don Quixote | Don Giovanni | Don Cherry | Don | Don (honorific) | Don Cheadle | Rostov-on-Don | Don Williams | Don Juan | Don Knotts | Don Imus | Don Carlos | Don Rickles | Don Omar | Don Henley | Salesians of Don Bosco | Don Johnson | Don Drysdale | Don Pasquale | Don Messick | Don Bluth | Don King (boxing promoter) | Don King | Don Shula | Don LaFontaine | Don Cherry (jazz) | Don Burrows | Don't Look Now | Don Siegel | Don McLean |