Hekatonkheir ('青'のヘカトンケイル, 'Ao' no Hekatonkeiru) is one of the Dragons that appear in the Unlimited Fafnir series. Although it was considered to be the blue Dragon, it was eventually revealed that it was a fake Dragon created by 'Black' Vritra as a stand-in for the purpose of spreading genes that would give birth to more Ds, as well as fighting against 'Green' Yggdrasil.