You need to get the baton - go to Shurugeon Castle and enter the moat on the EAST side, swim past the first overhanging towers and get out into the woods. The Samuria graveyard is there.
To become a Zen master you must collect all 4 elemental tomes which are scattered around the game world. The last one is found in Cet's tomb so you will only be able to gain Zenmaster at the end of the game (still worth doing!)
Wyv
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