What is that one material that always seems to prevent you from upgrading your champions? As someone with a constant ISO shortage I'm curious to see what resource is scarce in your rosters.
I have 3 t5b and over 12 t2a, but no 5 star champs that I want to r5, yet I have plenty of r3 and r4 worthy 5 stars yet literally no t1a available, even spend almost all my glory and still not enough.