2007 · ソースブック（プレイを拡張するルール／オプション）

Virulence

This fantasy roleplaying supplement expands the world of Contagion, detailing the war between divine and infernal forces, the Magi, eight Schools of Magic, eight angelic choirs, and eight demonic castes. It adds six playable races, eight character classes including Advanced and Prestige classes, 30 feats, and an Advanced Arcane Spellcasting system. Expanded rules and reference material support the races and classes from the core rulebook.