Location: Izmit Cave
The Marquis de Leon is the first boss you'll face, encountered at the end of Chapter 1 with Ragnar. He's a relatively straightforward fight, but can be challenging if Ragnar is underleveled or poorly equipped.

- Recommended Level: Ragnar Level 5-6
- Party: Ragnar (solo)
- Weaknesses: None significant.
- Resistances: None significant.
- Attacks: Physical attacks, sometimes a stronger 'Desperate Attack'.
Strategy: Ragnar should focus on physical attacks every turn. Keep an eye on his HP. When his HP drops below 20-25, use a Medicinal Herb. If you have any Seeds of Strength, consider using them on Ragnar before the fight. The Marquis de Leon doesn't have any complex mechanics, so it's a test of Ragnar's raw stats and your ability to manage his HP. Keep attacking and healing, and he will eventually fall.
Rewards:
- Experience Points
- Gold
While the Marquis de Leon serves as a formidable early-game roadblock in Dragon Quest IV, he later appears as a recruitable monster ally within the open-world exploration of Dragon Quest Treasures.
While this early encounter portrays the Marquis as a singular foe, Dragon Quest X later expands his legacy by featuring the beast as a powerful recurring boss within its expansive MMORPG world.