What are relics and psionics for you?

I've played arcs for a good while now and I'm having a great time w my friend! In the middle of my first campaign as admiral rn and its a blast!
But I was wondering recently about the two resources I mentioned. What exactly are they? Material, weapon adn fuel are self explanatory but relics and psionics got me thinking

Relics for me are treasures. Some type of long forgotten technology or valued items from antique civilizations. Taxing planets of relics would be like demanding an archeological digging in that planet. And the fact that you can spend relics for secure actions would be like gifting a monarch or giving technological advantage to some working guilds. That sounds really cool in my mind

However, I cant put my mind right in the psionics. Like, what kind of resource grants the power of copying an action from the lead card? Maybe I want too much flavour on the mechanics but I cant help myself. How can it be stolen and guarded? What is it!?

Anyway what do you guys think?