In the Shalya Parva of the Mahabharata, right before Bhima's famous mace battle with Duryodhana, Krishna tells Arjuna that Bhima should fight unfairly, as that's the only way to defeat Duryodhana. He tells Arjuna that even the gods have resorted to deception in fighting against the Asuras:
If he were to fight fairly, Bhimasena will never succeed in winning the victory. If, however, he fights unfairly he will be surely able to slay Duryodhana. The Asuras were vanquished by the gods with the aid of deception. We have heard this. Virochana was vanquished by Shakra with the aid of deception. The slayer of Vala deprived Vritra of his energy by an act of deception. Therefore, let Bhimasena put forth his prowess, aided by deception! At the time of the gambling, O Dhananjaya, Bhima vowed to break the thighs of Suyodhana with his mace in battle. Let this crusher of foes, therefore, accomplish that vow of his.
I'm familiar with how Indra used deception to defeat the demon Vritrasura, but my question is, how did Indra use deception to defeat Virochana?
For those who don't know, Virochana was the son of Prahlada, the one by Vishnu's incarnation Narasimha, and the father of Mahabali, the one defeated by Vishnu's incarnation Vamana. My understanding is that good and evil alternated in that lineage: Hiranyakashipu was evil, Prahlada was good, Virochana was evil, Mahabali was good, Bana was evil, etc. But the only story involving Indra and Virochana I know in Hindu scripture is the one found in the Chandogya Upanishad, but as I discuss in this question that story just involves Brahma imparting knowledge to both Indra and Virochana, with Indra correctly interpreting the lesson and Virochana misinterpreting it.
In any case, I wouldn't put it past Indra to engage in deception against Virochana; Indra lists various acts of deception in this chapter of the Kaushitaki Upanishad:
Know me only; that is what I deem most beneficial for man, that he should know me. I slew the three-headed son of Tvashtri; I delivered the Arunmukhas, the devotees, to the wolves (sâlâvrika); breaking many treaties, I killed the people of Prahlâda in heaven, the people of Puloma in the sky, the people of Kâlakañga on earth. And not one hair of me was harmed there.
I discuss in this answer how Indra used deception to retake Devaloka from Prahlada. But does anyone know any scriptures that describe Indra using deception to defeat Prahlada's son Virochana?