Maybe improving the AST card system? It is their icon afterall.

30 seconds to draw again seems a bit too long, Maybe 20 seconds? Or maybe the CD is reduce after you use the royal road or spread effect?

Then the royal road effect especially the 50% potency effect, it spread to nearby party member but the "nearby" part is too short from what i've seen like less than 10 yard, at least make it the same size as our helios range or something?

And lastly i wish SE give a way more obvious indicator/effect whenever i give the card to party, i always feel like my party didnt realized that he got the "buff", sometimes i got scold by party because of it, "AST where's your card? Use it etc etc" i did!!! Check your/other buff bar!!!

I wish the effect when you use the card is permanent at least until the effect is gone (like when you use defense buff, it give a green aura thingy? I want that green aura thing to stay appear like that for the whole 30 seconds)