[Wanda ponders briefly if she should tell him. She supposed there was no harm in it. After all, they were from different versions of Earth, and perhaps her telling him could, in some way, help prevent another Sokovia's ruin?]

His name is, or was, Ultron, a hyper-intelligent artificial intelligence. Supposedly, Stark created him to be some sort of peace-keeping initiative. Something that could protect the world if the Chitauri, or some other alien threat, were to ever attack again. Instead... he became just the opposite. A monster... determined to try and bring about the genocide of man, believing it to be a natural step in evolution. We, the Avengers that is, stopped him, but...

[Wanda's expression is forlorn. She immediately seems distant; her head somewhere completely different from their present reality.]

...at a cost.