Asmodeus, the Lord of Kings, is amongst the most powerful gods in the Astral Sea. Ruthless and ambitious, the divine devil has power and riches in excess of most other gods, and uses it to constantly claim more. The Lord of Nine works in bargains and deals and schemes rather than brute force, though his power is such that this is preference rather than necessity.
Ioun treated with Asmodeus to create Worldship because of his powerful diabolic magic. The power of a mortal soul is great, and devils have made the most use of them; no other magic would be great enough for the task Worldship was designed for. She spoke to him of the power in the Abyss, of the secrets and darkness hidden in the bloody depths of that unexplored realm, and the Lord of Nine saw great profit in aiding her. Though only devils (and those who have taken this secret from them) know it, Asmodeus has already tasted the power of the Abyss. Early in it’s creation, Asmodeus stole secrets and power from the Abyss’ dark heart, triggering the Blood War. That Asmodeus would invest in a chance to gain more surprises none of the devils of his legion.