It could be activated with a sprinkle of kumiss.
In the Year of the Helm, 1362 DR, the lama Koja of Khazari met a mysterious woman who'd presented him with a magical feast and attempted to draw an oath from him. Fearing a trick, he uttered the Sunlight After Storm sutra and flicked kumiss at her. She revealed herself to be god Deneir.
- It is unclear if the sutra pierced Deneir's disguise or if the god simply chose to reveal himself after the investigation.