Dark_Crawler was once known as Night-Crawler and was an ancient enemy of the Undying Ones. A cult worshiping the Undying Ones sent the Hulk to his dimension hoping the Hulk would destroy him. The battle that followed destroyed his realm and he was sucked into the Undying Ones' dimension[1]. He battled the demons and defeated their leader the Nameless One and became the ruler of the Undying Ones changing his name to Dark-Crawler.
He once wielded the sceptre of shadows, an object that could cause complete darkness. He claimed it had far deadlier powers but it was destroyed by the Hulk before he could use them.