Comments of chapter undefined of I Became a Progenitor Vampire

If he fused and gained the memories of the previous guy he will already know all of this... his personality would change slightly as well with all the experience the other guy had...

Its like “Mages are too OP” world O.o

and if he becomes a magician with the original body

If interest reached an apex (peaked) that means that from there on in his interest will be less. it doesnt sound like that is what the author means.