Hiraṇyakaśipu via his guru, Śukrācārya, is said to have deployed Kṛityā to destroy Prahlāda. I have read that it's some kind of an ogress or an evil demoness.
What's a Kṛityā? Is it some Māraṇa tantra (मारण तंत्र ) or some other kind of forbidden ritual?
What are some other instances of it being deployed against others in the scriptures, besides Prahlāda? And if it's forbidden, why would a great sage like Śukrācārya would use it (if he was indeed the one who did it), against an innocent child?