Brother showed up after Dante...well, I assume she used that seal on you. You're the one that told Brother how to seal and kill a homunculus, in the end.

[Al sighs then.] ...Scar made me into the Stone to save my life. My armor had been transmuted, and I was going to explode if he didn't do something. After that, Brother and I ran, and we saw Dad when we went to Risembul to hide. He went to confront Dante after that, though we didn't know where he'd gone at the time.

I was lured into a trap, and got captured. Brother, he came after me, Envy had taken me to the city under Central. And when he showed up, they fought, and--

[Al's voice catches, and tears prick at his eyes.] H-he died. I, there wasn't any other choice, I was the only one that could bring him back.