you will not be told how you get the nexus back, but you WILL get it back in act 3, arc said he wasn't gonna tell anyone and spoil the story
(him just tryna make me more desperate to learn about the story that i wanna play so much) (nah jk lol he isn't gonna tell me bc it's the story, but i do wanna play it BADLY, i'd love to play it without spoilers)