Alright, cool >_O.
I guess i could take some of my own words, considering i explained what i knew about the element in the previous training.
Earth release, or Doton is a very useful(if not the most useful) nature element in the ninja world. You can change the entire battlefield, raise huge stone shields, trap your enemies, dig underground to prevent damage, camouflage, create tools, stab your opponent with earth spikes etc.
The earth element is used in a variety of Kekkei Genkais, or "bloodline limits". The examples are the following:
Lava Release/Yōton
The combination of Doton and Katon is used in order to create this Kekkei Genkai.
Steel Release/Kōton
The combination of Doton and Katon(i think, judging from the KG's restriction which implies the user must master Doton and Katon) is used in order to create this Kekkei Genkai.
Blast Release/Bakuton
The combination of Doton and Fuuton is used in order to create this Kekkei Genkai
Wood Release/Mokuton
The combination of Doton and Suiton is used in order to create this Kekkei Genkai
Dust Release/Jinton
The combination of Doton, Katon and Fuuton is used in order to create this
Kekkei Tōta
Doton is most effective against the water element, as it can easily stop the currents and masses of water produced by the enemy. Earth will naturally absorb water.
Dotons weakness is the lightning element, since it easily breaks down/shatters upon an electric impact.
Alright, i'll perform my last learned doton technique then

.
*Alucard starts off by focusing his chakra. He then proceeds by moulder it up to later form it into doton chakra, by using his nature affinity/nature transformation technique. Alucard then channels the doton chakra to his mouth in order to form the mud that he will spit out on the target. If there now is a target..somewhere..>_O. Alucard has now filled his mouth with earth chakra which he then spits out, causing a minor stream of liquid mud appear from his mouth.
*