The Frostfyre Wyrm (Dracunculus ignis glacierum). This beast likes it when it's hot and cold at the same time, and is highly resistant to magic
This is the 2nd version, slightly different from the original (which is way better looking in my opinion). I'll upload the original when I find it (I have the uncanny habit of misplacing memory sticks and the like).
Drawn on paper with a black gel pen, colours & effects with Photoshop.