Sol is part of the Element 4 group. He along with Juvia were sent to capture Lucy to bring her back to their master, Jose. He is nicknamed Sol of the earth, as shown by his name his magic consists of controlling and creating the different forms of earth (sand, rocks, etc.) he has also been shown to be able to wrap his body around a persons arm maybe even their whole body. Sol often uses French linguistics in his speech as well as talking in a rhythmic pattern, he also gives his attacks musical names mix with the French names of different kinds of earth (Roche[rock] Concerto, Plâtre[plaster] Sonata, etc). Sol is also French for "ground".

(Source: Wikipedia)