Quasi-elementals
Quasi-elementals are a fusion of one of the classic elements and either positive or negative energy.
Types of quasi-elementals deriving from elements infused with positive energy include lightning (air), mineral (earth), radiance (fire), and steam (water). Types of quasi-elementals deriving from elements infused with negative energy include ash (fire), dust (earth), salt (water), and vacuum (air).
Quasi-elementals' stats have not yet officially appeared in any Third Edition Dungeons & Dragons product, although a number of fan conversions do exist.
Read more about this topic: Elemental (Dungeons & Dragons)