The Tcho-Tcho Expansion adds a new faction to Cthulhu Wars. The Tcho-Tchos are a human-based faction representing the physically advanced, but ethically repulsive Tcho-Tcho tribe with the ability to interfere with other players by worshipping their Great Old Ones! Your own Great Old One, Ubbo-Sathla, is a tool and slave, not an object of worship!

Unique among Cthulhu Wars factions, the Tcho-Tchos have access to three high priests. In addition to the standard power generation and pacing benefits granted by recruiting additional high priests, the Tcho-Tchos exploit this advantage through two spellbooks (Hierophants and Martydom) based around high priests. The other distinction of the Tcho-Tchos is the way they interact with other factions; the spellbooks Tablet of the Gods and Idolotry enable the Tcho-Tcho faction to leech off other players, and Soulless makes your cultists less attractive to capture.