Boardgamegeek https://boardgamegeek.com/boardgameexpansion/254122/arkham-horror-card-game-city-archives-mythos-pack
Anglais - Following the events of Heart of the Elders, you and your team of investigators have journeyed deep into a series of caverns where a new world lays hidden from the outside world. Strange creatures that cannot be of this world have seemingly lived beneath the shell of the Earth for centuries.