Vincent listened to Millie and Ceri's request and found it really interesting.
First of all, their Primal Sword Sect actually has a secret technique that allows them to get even stronger. It involves the usage of Magic Beasts Cores so they immediately went to him in case he decided to waste them.
Vincent had never heard of something like that at all. He previously thought that the Magic Beast Core, also known as Magic Nucleus according to his system, can only be used to add specific abilities to any weapons or perhaps to Transcend an item.
Anyway, it is good to know that it has other things it could do since it wasn't even mentioned in his Arcane Mysteries Class.
"Alright… According to your secret art, the core has to be modified by adding a Fine Burr or a similar component that increases the durability of the core… Before the durability has increased, the secret art can't be triggered." Vincent repeated.