Djinx was a fire creature.
Thousands of years later, Clara Oswald bought the bottle from a shop in Shoreditch. Upon opening the bottle, she released Djinx back into the world. Djinx then trapped the Twelfth Doctor and the TARDIS inside the bottle. Clara was able to stop Djinx by shouting at him, something he wasn't used to. It enabled the Doctor to break free of the bottle. He then encased Djinx in a vacuum, depriving him of oxygen. Encased in the bottle once more, the Doctor secured it away in the TARDIS so that he could never escape again. (COMIC: Doctor in a Bottle)