Over time, the gods tried to stop Asmodeus and his people from accessing various privileges and rights, but Asmodeus was able to protect them through his legal knowledge by suing the gods and pulling arguments they could not counter, as well as negotiating with Darkness.
Afterwards, Asmodeus worked as a lookout over Tharizdun's prison, during which time he started playing with Pazuzu, a demon lord of the obyrith, came to him and they had a conversation.
The demon's flattery caused Asmodeus to develop a sense of pride that turned to arrogance and the desire to rebel against now called the One That Was, now Asmodeus maintained a stable secret alliance with Pazuzu.
Being who served as his general and was vital in eventually killing the One That Was. A side effect of Asmodeus' corruption was that he began to hear the location of the evil shards.