Blood of Kali
From Multiversal Omnipedia
The Blood of Kali was a sinister concoction was used by Mola Ram and his followers to "convert" unbelievers. Believed by the Thuggees to be the actual blood of Kali, it turned all who drank it into mindless slaves by making them experience the Black Sleep of Kali Ma, but being burned was a way of snapping the victim out of their stupor.