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So, my rune was lvl 39, 348097 XP to 40. I decided to bought the new research that increases 2% SI Rune Exp, but my rune XP didn't change at all, I thought this research was meant to be retroactively like many others.
Is that normal or not?
What you mean only apply to challenges at the moment. Where the level up EXP requirement goes down by a few procent.
The research you're talking about increases the EXP you get when spending offerings. So EXP gain per offering goes up.