Iwagakure Kinjutsu

This kinjutsu, which was passed down through generations in Iwagakure, allows the user to knead chakra into materials. It is likely that the mouths on the user's palms and chest are the result of using this technique.

Deidara stole this technique in his quest to find the ultimate art and used it in conjunction with his Explosion Release to infuse explosive chakra into clay, creating his signature Explosive Clay.

All techniques seen with the kinjutsu have been only Earth-based jutsu, albeit namely since all of them have been used by Deidara and his clay. Give the nature of the jutsu, it's implied that it was made for Iwa nin to infuse any nearby earth with their chakra.