Yes, i know i already showed her. But this time i'll tell y'all what she does! Also here's how to get mastery on Luna: Complete 5 floors with both Luna and Astro in the team. Escape a twisted using your active ability while at 1 heart. Complete 15 floors without ever interacting with a fake ichor machine. Extract 30 machines as Luna. Survive to Floor 15 in a single run without losing any hearts. Use Luna's active ability 100 times.
Twisted Luna can draw a fake Ichor machine that becomes 3D and looks real from a distance but if you try to extract from it then it vanishes into a puddle of ink that slows you down and alerts her to your location. (It's based on the fact that Luna is an artist like Brusha)