Build a massive underground frozen ...

Build a massive underground frozen kingdom for a Minecraft RPG world called Frosthelm. Concept: Frosthelm is an ancient kingdom hidden deep beneath a frozen tundra. The entire city exists inside a gigantic underground ice cavern. The environment should feel mysterious, powerful, and ancient, like a lost civilization carved into the frozen earth. Scale: * Extremely large build designed to feel like a kingdom, not just a town * Central city hub with multiple districts * Vertical space with towering ice caverns above the city * Giant ceilings supported by frozen pillars and carved stone structures Environment: * Huge underground cavern filled with ice formations * Massive stalactites and stalagmites made of ice * Frozen waterfalls flowing down cavern walls * Snow and frost covering struc