Two-headed Dragons are those whose bodies are composed of two separate heads and necks (and therefore two separate consciousnesses) that share one main body, one tail, and one set of limbs. The degree to which the consciousnesses are integrated varies depending on the breed. Two-headed dragons can only breed with other Two-Headed dragons (regardless of what other sub-type(s) they may be, such as the Two-headed Lindwyrm), and their eggs cannot be bitten by Vampire Dragons.
On August 20, 2017, a site update wherein new descriptive text for this morphology type was added to a two-headed dragon's page. This text is included in addition to the regular dragon description, going underneath it, and it describes what two-headed dragons are in the context of the Dragon Cave world.