Epidemic was the second expansion set to the .hack//ENEMY card game. Two starter decks were released for this series, modeled after Mia and Elk.
"An Epidemic of what? Grunties, Level 2 PCs, Mimics, Demons... you name it, it's here. Epidemic includes 100 all-new cards: 27 each common, uncommon, and rare, 9 Xtra rare foils, and 10 premium foils. Two different 60-card starter decks feature Level 2 Elk and Mia; also available in 11-card booster packs."