The Endarkened, also known as Endarkened Ones or Dark Shadowhunters, were Nephilim who became corrupted after drinking a mixture of the blood of the Greater Demon Lilith and the blood of Sebastian Morgenstern from the Infernal Cup. In accordance with Nephilim society, these dark Shadowhunters wore red gear and bore red runes, symbolic of the "ceremony" held, or the change they underwent, when the Shadowhunters became Endarkened. Since their lives were bound to the Infernal Cup, its destruction caused the deaths of every single one of the Endarkened it created.