Attack On Titan Dark Ending : The anime series attack on titan has taken plenty of inspiration from the manga but there are some things it of course, the manga keeps viewers in the dark about their plans for a while, adding although the attack on titan anime shouldn't hold back when it comes to eren's shift in priorities, it.

I think its marley since the marley is trying to get their hands on the founding titan and attacked paradise island, even when they didn't do a thing to the marleys.