That guy from Saga Frontier in riki's quest that you have to use combos to beat. (I forgot his name but I know he's one of the mystic lords.)
Edit: Vergil
We have a winner here.
1. Needle Hell
Chamber of Courage Ring
2. Math Quiz
Chamber of the Merchant Ring
3. Fiery Doom
Chamber of Life Ring
4. Barrel Search
Chamber of Hermit Ring
unused clues
5. Graveyard
Chamber of Protection Ring
6. Money on the floor
Chamber of Thief Ring
7. Tournament
Chamber of Warrior Ring
8. Trap Switches
Chamber of Tactician Ring
9. Super Combo and Fire Works
Ring Lord himself