The earth elemental is the younger brother of the legendary d'ao, the genie capable of creating earthquakes and flattening mountains. Younger, and less powerful, but also more mischievous. Felling trees, crushing walls and smashing people to pulp can be counted among this creature's pranks. But only if their master allows it, of course.
The earth elemental always serves its summoner faithfully. It is most often employed as a guard, as it is tireless and always vigilant. It does have senses as living beings do, but it always recognizes the presence of intruders. It has no fear of monsters, let alone humans.
This monster's most dangerous weapons are its mighty arms. A blow from the earth elemental is akin to a battering ram hitting a city gate, and turns a normal human into a bloody stain. Its ripostes are especially dangerous, for this apparently sluggish creature can strike swiftly as well as strongly. Thus one has to defend oneself against its blows with all available means, including potions and Signs. According to the "fight fire with fire" rule - or rather the "fight strength with strength" - one should also use strong blows against the elemental, since only such attacks can grind its stone body down.
The earth elemental's body is solid rock, so the creature cannot be poisoned or blooded. It is best to summon a team of dwarven miners to use pickaxes on it until its done for. However if the witcher has no such team at hand, he should use regular means. The earth elemental, though it has no weaknesses, can be beaten.