Discovery, Scientific
We confronted Ingrid and learned she was clueless. After finding another Lichenposter imitating Ingrid we checked all Ingrids. We learned all might be fake and the real Ingrid might be the source of this disaster.
We confronted Ingrid about the hidden room in her garden. Incredulous and confused she asked us to show her the room. She seemed genuinely shocked. After going deeper into the room we found another blob with a Lichenposter. This one, unlike the previous one, was Ingrid's spitting image and could speak. in a panic we knocked her out. We brought all 3 Ingrids back to an old chapel of the Storm Twins. Through a rite they were judged by the Twins, while the first lichenposter got smited, the other two passed the test. Because both succeeded, we know believe none of the Ingrids we know of are real and that the real one might be the source of this disaster.