Perhaps Sumer came up with the creation on her own. Remember, Sumer and Fellana are bother practitioners of magic and strongly interested in learning more, same with Liz. All delved deeply into areas that were probably best left unknown, hence Liz getting white hair and see Crusher and Sumer becoming twisted. Because Fellana seems to have come out the best, only a supreme case of bad luck.
Sumer probably discovered through her research the method to create the dolls, Fellana opposed but didn't listen to her and did it anyway. Anna hence plotted to use this for her own means as a way of creating an endless army of robotic golems of varying abilities. Galdirae having ties with the evilest of forces in Lavato could easily have come accross the same thing as Sumer or indeed have gotten it from someone. He could have just taken a few of Belfyna's dolls and experimented on them to discover the secret behind them. Plus, Asta and Esria I'm not sure if Sumer created ... they are very different then the regular dolls, so those might be from Galdirae as well, or someone else of the evil side.



