"Your good was a bonus, my own good was my primary concern. After all, I had little reason to stay here. Stay and be branded a traitor and killed by the Dark Lord, or leave and pretend to die. No one would miss me, Mother would have a tragedy to gain herself some sympathy and favors and I was still alive, and hopefully, others would finish what I had started. Especially once the prophecy was revealed." Regulus shrugged, narrowing his eyes a little.
"Your godson hasn't told you about them, then? I thought for sure he would have figured it out by now," he said thoughtfully. "Especially after...." He shrugged. "You've heard of horcruxes?"