It was more than just Remey's new experimentation to make an undead melting potion as she called it. Genesis had taken a turn with a new idea that an entire land was filled with an odd mana.
The theories about other forms of mana that could be appearing in the expanded ancient areas of the world had been born before this undead land was discovered to have grown from the undead ruins they already knew.
Since this was just enhancing those theories it put fuel on the fire.
Many people believed that the lava fields would hold a hidden area where there might be more manas mixing together. The fact that earth mana and metal were considered the same for such a long time had finally been broken as some believed that metal was a condensed form of earth mana with even more unique characteristics.