This was posted by Walrock Homebrew on Twitter. "Though the Opportunity rover has gone on to robot heaven, it can live on in your [D&D] game. Here's a fairly-accurate statblock for our rover friend, and a nearly plausible reason for it to exist!"
Oh dear. As some of y'all know, I'm using Borderlands 2 maps as a significant portion of my megadungeon, and if you've played the game, you know there's place called Opportunity that's full of robots.