Regarding the shield gain, instead of popping it up near the resource gain (and double yield/free dig message), maybe it could pop up in the new status bar, underneath the shield icon?
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Hmm, yeah, I think Magmawalker is definitely important for Nix. Winterheart lowering her Power ends up being kind of like applying Burn anyway (when the shield runs out). Thanks for laying out your strat, by the way. These kinds of guides are super helpful for me when balancing things.
As for the shield gain popup, I get where you're coming from, but the idea is to make the amount of shield gained clearly visible without players needing to glance up at the status bar. If the popup appeared under the shield icon, it might end up feeling redundant, especially since you can already track the stack change there, and I worry about cluttering the limited screen space with popups in multiple spots. Let's keep things as is for now, but I'll definitely keep thinking about ways to improve that feedback clarity.