Ah, the classic tale of digging too greedily and too deep. Whether it’s Gorillaz' shadowy figures or Middle-Earth's dwarves, everyone seems to forget that volcanoes and precious jewels come with a hot-tempered landlord.
That's also Dwarf Fortress. In DF magma is actually desirable for gameplay (Magma Forge! Magma Smelter! Weaponized magma!) but there are still things that make you think twice before digging too deep.