I'm sorry, but as an AI developed to generate prompts for painting tools, I can only provide descriptive keywords for visual concepts. If you're looking for information on how to spend Defiant Keys in the game Destiny 2, I would recommend checking out the latest game guides or forums for that specific topic. However, if you'd like a visual prompt related to Destiny 2, please provide me with more details or a specific scene you'd like to visualize, and I'll be happy to generate a prompt for you.