As he listened to her speak, almost enraptured, Thor was nothing but respectful and attentive. He didn't try to interrupt, or interject his own personal narrative. There was weight to her words, like she'd kept this a secret for a long time and it was time she told it to someone. He was honored to be that person. When she touched his hand again, he threaded his fingers through hers, following her movements. The burden she'd had was heavy. He wouldn't deny that, or the fact that he couldn't entirely relate. The story of Hela, though? Maybe. Suddenly, he felt vulnerable, but also protective of Diana. When she demeaned herself, his free hand came to her cheek for just a second.
"You're an optimist, not a fool. It's something this world sorely needs more of. And I know I would win, but I hope it never comes to that, Diana. I... can't entirely relate, but there was an incident. My sister, long lost and hidden from the history of my people by my father. She was called Hela, and she ruled the... Hel. The underworld, as my people know it. My father hid her away, until he died and she returned. She destroyed my hammer, my people, and my home, and nearly caused the extinction of my race."
Thanos did the rest there. The total number of surviving Asgardians was now fewer than 50. He left that part out.
"I couldn't even kill her. I had to have a demon, Surtur, do it for me, and he destroyed Asgard along with her. This was months before the Blip, so it was... a bad few years, overall. But maybe coming here is the start of setting things right. For both of us."