If we’re talking about the most in a short amount of time then Act 6 when it was first released. The sheer amount of T2A available for that exceeded anything else at the time and I got many rank ups in a very small window.
Most impactful over time has to be AQ though. The rank up mats obtained are invaluable. It’s a shame it’s so repetitive and 90% of it can just be taken by Corvus though.
Final run of Blade featured crystals around 3ish years ago. Bored with the game and lamenting my inability to pull top tier 5*’s, I burned units on two Blade crystals and got him on the first one. I had been sitting on a skill AG from the 12.0 payout and took him to R4 immediately. Transformed my roster and allowed me to crush Act 5.
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Most impactful over time has to be AQ though. The rank up mats obtained are invaluable. It’s a shame it’s so repetitive and 90% of it can just be taken by Corvus though.
Dr. Zola