Vincent the Grand Teacher!
Vincent could still increase his strength and stamina stats by ten points, but he would need to become the owner of the demon king's requiem first.
It wasn't going to be easy to do that, though.
He needed to pass a trial, and he didn't know how hard it would be and how long it would take him to finish it.
He decided to do it after solving the current affairs of his life.
Do one thing at a time; that's what Vincent wanted.
First off, he needed to train Eric, Salvador, and Gale.
After they succeed in purifying the ingredients, the rest of the class will naturally come to him and ask for advice.
He would just tell them what they needed to do, and as long as they stuck to his plans, they too will become proficient in the purifying process.
Then, once half of the class learns it, Instructor Alex would've no choice but to move his lazy butt and teach them the rest of the things related to alchemy.