2004 · Kaynak kitap (oyunu geliştirmek için kurallar/seçenekler)

Aliens: Game Over

A role-playing supplement for d20 Modern set in a bleak future of corporate power, mercenary companies, and military marines confronting hostile alien life. It adds two races, new occupations, marine divisions and corporations, feats, psionic powers, equipment, power armor, advanced classes, worlds, monsters, and rules for creating missions. A mission-generation system supports expeditions and combat against a range of alien threats.

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