Ple-Sen
There's a chance, by the way, that it wasn't Ludovic who was summoned at all, but yet another mighty sorcerer.
When the deed was done, it turned out that Faust had deceived Ludovic — the mind of the lord of Sintan had been transferred into the body of his daughter, while Faust's mind ended up in Alvarez's body. The enraged "Ludovic" lunged at the scoundrel, intending to gouge out his eyes. "Faust" panicked and used the first spell that came to mind, and they both froze as if in a crystal chamber resembling ice, and remain in that state to this day. No one knows what truly happened then, but the most common version holds that Lucretia tried to kill her father, and Faust (whose body had turned to dust) tried to save the lord.
But for me and Geroyist, a sorcerer is probably preferable to Ludovic...