There are many types of powerful equipment in "Beast of Reincarnation," and the Silent Robe is one of the most useful sets. To obtain the Silent Robe, go to the Ruins Entrance teleport point in the Ancient Civilization Area of the Kanto region. Along the path from the teleport point, you will find a cave; open the chest inside to get the Silent Robe.
How to Obtain the Silent Robe in Beast of Reincarnation