Vanir

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.

Tribunal of Ages
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.

Known Vanir

 * Aggramar
 * Eonar
 * Khaz'goroth
 * Sargeras

Earth giants?
Unlike the Aesir-storm giant relationship, nothing else has ever been identified as an "earth giant." Alone, this would mean that there was little doubt that the Tribunal of Ages was talking about titans when it said "Vanir."

"Earth giants" were mentioned in a WorldOfWar.net preview of World of Warcraft: Wrath of the Lich King, during their commentary of an interview of Jeffrey Kaplan. They said "Players will discover their city of Thor Modan, which is a replica of Ironforge, but it has mostly been destroyed by the Earth Giants, who are opposed to the Iron Dwarves." The creatures that they are referring to are the Grizzly Hills Giants (mountain giants, which are creations of the Aesir), lead by Kurun (a stone giant). Colossi may also be involved. However, this report may be in error, and none of these things may be Vanir.

Myth
The Vanir are one of the two pantheons of gods in Norse mythology, the other being the Æsir. Famous/well known Vanir gods are Njord and his twins, Freyr and the Goddess Freyja. All three were sent to live with the Æsir to seal a peace agreement between the two pantheons.

After Ragnarok, these three — along with Balder, Hoder, and Thor's sons Magni and Modi — would rule the new world that would arise after the climatic battle.

Interestingly, the Vanir in Norse were more associated with the Elves than the Dwarves.

Many also believe that although the Vanir are greatly centered around the earth, harvest, and seasons, they are no less stronger than the Æsir for they were able to contend with them in the Æsir-Vanir War until both sides agreed a truce was the best course of action.