A plan revealed,
..and in time, executed. The real reason Jade is investing in long-term maintenance on her prosthetic is her plan to enchant it, meaning she'll have to do any work on it that needs doing for the foreseeable future. However, we aren't going to see that just yet. We've got other people to check up on!
The runes covering her robotic arm was part of Jade's original design, back when all I had were a few shitty concept drawings to send to my vtuber artist and the tagline of "cyberpunk magical catgirl", and the act of her enchanting it was one of the first images I ever tried to make when I was first learning Daz. Now, a little over 2 years into the comic I'm finally getting around to it! yay!