Gaia's secret art is one of the ultimate dwarf secret art. Although it is recorded in the dwarf's long history, it only gives a general description, not the art itself.
As the secret art is being stolen and few know about its content, these master dwarves could only learn about it from its trace. Though it will not give them the secret art or learn about it, it still benefits their Earth elemental mastery.
Moreover, Gaia's secret art is not only powerful but also hailed as the core earth elemental technique. No matter how unique an earth elemental art is, it will somehow be connected with Gaia's secret art.
This is also one of the reasons for being named after Gaia, the mother Earth. Some rumors even say that if someone masters Gaia's Secret art, they also master all the Earth's elemental arts. Therefore, even a trace of Gaia's Secret Art is enough to entice all these dwarves.
