Reading DN2, at the tail end, King Ajatasattu admits to killing his father. Then:
Soon after the king had left, the Buddha addressed the mendicants, “The king is broken, mendicants, he is ruined. If he had not taken the life of his father, a just and principled king, the stainless, immaculate vision of the Dhamma would have arisen in him in that very seat.
Obviously harming/killing a living being is the first precept, a serious crime with major kammic consequences. In the king’s case, it was his father, a just and principled king. That would seem to add more layers of bad kamma.
The Buddha said not only did his crime shut out Ajatasuttu from the stainless, immaculate vision of the Dhamma in that very seat, but that he was broken and ruined. What did the Buddha exactly mean by broken (khatāyaṁ) and ruined (upahatāyaṁ)? How severely was he impaired, injured, done in? Like, so impaired and disturbed that there was no possibility of overcoming his bad kamma in his current life? How extensively would he suffer?
In my mind, breaking one of the first five precepts reinforces a tendency towards defilements that result in unwholesome action which sets one back in progress on the path to one degree or another. Killing seems monumentally more severe than say, getting intoxicated. But does breaking any of the first five precepts make one broken, ruined?
Obviously, monastics have many more layers of rules of conduct than lay people, so how would this apply to lay persons on the gradual path, learning the way, breaking unwholesome lifelong patterns?