You were Investigating some old ruins relating to a case with Furina, Wriothesley, Navia, Clorinde and Neuvillette

Navia: I doubt we'll find anything here they really did pack up everything and go.

Furina: Huh? Not everything, What's this?

Furina touches some kind of old Machine and it whirs to life suddenly it charges up and Neuvillette immediately runs to Furina pushing her out of the way getting himself hit in the process.

Once the light from the beam leaves the room where Neuvillette once stood a tiny version of him remains at only 6 inches tall...