Nephele -
In Greek mythology, Nephele (/ˈnɛfəˌli/; Greek: Νεφέλη, from νέφος nephos ”cloud”; Latinized to Nubes) was a cloud nymph who figured prominently in the story of Phrixus and Helle.
Greek myth also has it that Nephele is the cloud whom Zeus created in the image of Hera to trick Ixion to test his integrity after displaying his lust for Hera during a feast as a guest of Zeus. Ixion failed in restraining his lust for Hera, thus fathering the Centaurs.

Mythological creatures around the world | FeyfolkDryads come from Greek mythology and are female tree spirits. They are generally very shy and hard to catch a glimpse of as they hide deep in their forests. The dryads are tied to their trees; they will become injured when the tree is injured, and they die when the tree dies. For this reason, the Gods punish any human who harms or cuts down trees without first propitiating the dryads.