It felt like the world was crashing around him, the pieces that once made up his reality were shattered as they hit the floor.

"So...you're saying....I'm...?"

Grian nodded.

"But why tell me all this now?"

"Would you have believed me if I told you earlier? When you didn't know I was fae? When you weren't searching for answers?"

Well, Grian did have him there. Had the situation been different, Mumbo would have called Grian a liar. He's still tempted to, but too many things lined up. Too much made sense for it to not be true.
Like the small shock he got when he was around iron, chalking it up to static electricity, or the fact that he had a hard time finding his redstone supplies- previously explained away by a cluttered storage system. Sure the same things that affected Grian also affected Mumbo, but it was clearly to a lesser degree. Mumbo wasn't losing his redstone by the handful like Grian was.

"Mumbo, I am sorry to drop it all into you, but one way or another, you would have asked how you could read fae runes." Grian said gently. "After all- you're the only hermit who didn't know their past when they came here, right? I felt bad keeping it from you."

"Hey G? Can I ask you something?" Mumbo asked, his voice breaking the silence that had stretched out between them.

"Go for it."

"Did I ask to forget? Or were my memories taken from me?"

Grian's hesitation told Mumbo all he needed to know, and yet, he couldn't find it in himself to be mad at Grian. "I...they were taken. I took them."

Mumbo took another sip of the coffee, tilting his head. "Why?"

"You found this realm right as Thorn took over and the fighting started to get bad. Maybe it was selfish of me, but I wanted you to move on happily. Without regret of who you left behind or the temptation to come back." The faerie stared at his lap, fidgeting with the hem of his sweater.

Mumbo softened, a gentle smile on his face. "Thank you." He hummed, falling back into a comfortable silence before another thought pushed its way to the forefront of his mind.
"Earlier, you asked for my and Scars name. If...if I understand correctly, names have power, right?"

Grian frowned in confusion, staring up at Mumbo with his head tilted. He looked like an adorable puppy when he did that, but now was not the time to dwell on that.

But Mumbo felt he could trust Grian wholeheartedly, the faerie being honest with him. "I am Mumbo."

And Grian's eyes went wide as he realised what Mumbo trusted him with. No trickery, no fancy wording to make loopholes- just complete and genuine honesty as Mumbo willingly gave his name to the faerie.

"Mumbo." Grian said, his eyes wide with shock and happiness. He had Mumbos name not through trickery, but through trust. It was a gesture the redstoner couldn't take back and the fact that he trusted Grian enough for him to willingly surrender it... well. Grian would make sure to show that Mumbos trust was well-placed.