Who is Grandpapa Cretch from Storm Thief and what is their importance?

Grandpapa Cretch is an elderly toymaker. He lives with his granddaughter, Ephemera, inside a wealthy tower which houses his many creations and laboratories. It was Grandpapa Cretch, who first discovered the golem Vago after he became displaced by the probability storm. Grandpapa immediately 'adopted' him. Gandpapa Cretch is described as bad-tempered, violent, and a traditionalist.