- "That I, Won-qu should be humbled by one other than my master... Thou art the one my master awaits. ...This then is rightfully yours."
- — Won-qu to party after defeat
Won-qu's Gem is a Key Item provided by Won-qu after the dice fight in tomb.
Story
Ryu fights Won-qu and gains access to the Tomb. He and the party fight onward, solving various riddles along their way. Eventually, they are forced to fight two giant dice. After their defeat, Won-qu appears again. He commends the formidable skill of the party and gives them his gem.
The gem triggers a mechanism in the central cube in the stairwell room which allows Ryu and the others to use a hidden passage to Mukto.