From what Marvin knew, although the Snake Witch was cold-hearted and unyielding, she still had a fatal weak point.
The Witch Queen's curse made her unable to see the sun, or else her skin would fester. But she was originally a Human from the surface.
Longing for the sun was an instinct that every normal lifeform had.
The information he knew of suggested that the Snake Witch frequently left the well-protected cabin for the surroundings of the Courtyard Area, looking from a distance at the rare sunshine piercing into the Underdark.
Even from that distance, she could feel the temperature rise somewhat.
Maybe this was the driving force behind her desire to remove the curse.
But for Marvin, this was a way to bypass her defenses.
After all, even if he was powerful, forcibly breaking into the lair of a millennium-old Witch would be very risky.
The soil in the path that Marvin was walking along had become a lot more solid.