The technique in question.
(Doton: Koka no Jutsu) - Earth Release: Hardening Technique
Rank: S
Type: Offense/Defence/Supplementary
Range: Short
Chakra Cost: 40 (-15 per turn)
Damage Points: N/A
Description: The user releases a burst of earth chakra from all over his body. As he
does this, a multitude of rock seemingly
grows from his skin, forming a large, dense
armour or rock much bigger and bulkier than
the users original size. The armour can be
manipulated and used to create extendable weapons to strike a target with like
rudimentary swords or hammers. The
downside is that the user cannot mold
techniques from other elements a part from
earth while sustaining the armor. The armor
can be manifested in only specific parts of the body if the user so chooses.
That is actually a trick question. You can combine this with another earth jutsu but not other elements. However, if you have any clone or ally around, both of you can do a good inter-elemental combination where you wear the armor and the ally/clone coats it with another element.
Good, any question?