Thoth was a Desert World in the Segmentum Pacificus. It was part of the Macharian Crusade and was liberated from Chaos worshipers.
A unit of Tallarn Desert Raiders, especially chosen for the type of planet, led by Captain Al'rahem used the native N'go tribesmen and conducted a guerilla campaign against the Chaos followers on the planet.
The Inquisition soon declared Thoth Amundi Heretica and cleansed the world with virus bombs. Al'Rahem campaigned for the N'go to be relocated due to the aid they provided, and his requests were granted. The N'go were evacuated, along with genetic samples of the flora and fauna of the planet.
It is now a dead world and will continue to be so until the effects of the virus bombs die away.