The Succubus Queen had placed a curse upon Samuel and when the curse was over Samuel went on a journey meet that same Succubus and battled it out. Samuel won by imprisoning her.

As for Eliphas's desires for taking over the world. He just wants it for his own not because Kurn was once God's. he always craved it and wanted it and dreamt of it like no other sense his first walk upon its surface. He was banished from Kurn and thrown into the abyss where all Tanar'ri reside. There he waited his 1000 year sentence. His love, the Succubus remained in wait but got careless finding Samuel a easy distraction. When the sentence was over she and Eliphas had to make a compromise so Aries the Erinyes in place of the Succubus Queen put Eliphas's return into motion. When he arrived he moved against Lithium as a test of his strength.