After killing the dungeon boss, Eldrian hadn't blacked out. He had managed to survive the blast and his collision with the wall. His body truly had grown stronger. Normally, he would be dead right now.
Sure, he was in a bad state. But his friends had reacted quickly and moved to help him. He hadn't even needed to force himself to cast some self-heals.
Of course, it wasn't just his body that had grown stronger. His soul had also been conditioned, and while Eldrian still had room to grow, he was doing so at a proper pace.
Still, that didn't mean he had joined the others in the cleanup. Sure, for once, he was able to. But he couldn't answer their questions, so he faked unconsciousness by hiding in his mind space.
He had tried to reach out to Ziraili, wishing to talk about what had just happened. But that wasn't working. Either she was busy, or the dungeon subspace was interrupting his communications.