Combat rating: -6
Power: Malaise - While Tsathoggua stirs in his slumber, investigators cannot use the special ability of any locations other than the Arkham Asylum, Curiositie Shoppe, General Store, Ye Olde Magick Shoppe, and St. Mary's Hospital. This does not prevent investigators from having encounters or traveling between cities. In addition, all Urban cards are discarded without their special effects taking place.
Start of Battle: Investigators discard all Clue tokens.
Doom Track: 13
Tsathoggua was first mentioned in H.P. Lovecraft's The Whisperer in the Darkness (1931) and again in The Shadow Out of Time (1936), although he was invented and first described in Clark Ashton Smith's short story The Tale of Satampra Zeiros (1931). Published only a few month's apart, Smith's story was actually written a year earlier. Tsathoggua is a primary deity in Smith's Hyperborean Cycle.