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Following the imprisonment of the Old Gods, Vanir were appointed as protectors on Azeroth. Vanir, in common nomenclator is "Earth Giants." There was at some point global combat between the Aesir and the Vanir because of something related to Loken. Loken neutralized all remaining Aesir and Vanir affecting the termination of the conflict.
There are two presumed types of titan, the stronger, smarter, more agile Aesir, and the tougher but less powerful Vanir. The Vanir are bronze-skinned giants who crafted the mountains and deep places of the world. Their children are the dwarves and cursed troggs who helped them carve out the earth. Like the Aesir, they tend to stay away from mortal creatures. Vanir titans know the location of all stonework (such as sliding walls, stonework traps, new construction, unsafe stone surfaces, shaky ceilings, natural and artificial tunnels and caves, and the like) within 1 mile. Something that is not stone but is disguised as stone also counts as unusual stonework. A Vanir titan always knows his depth underground. They have a connection to the element of Earth.