I'd like a new Klimaform spell that provides unique enhancements based on the weather you have (-pdt for dust, crit damage for thunder, etc).
they could even just add those stat boosts to stormsurge, instead of just int/mnd/str/etc. Windstorm would be cool for a haste boost, or whatever. Storm/klimaform/merit changes are a pretty big opportunity for "unique sch crap that doesn't suck".

When animus spells were first announced, my hopes were that they'd be a straight decrease/increase to current enmity. Using a sch in that way could create an entirely new party mechanic. It was pretty disappointing to see it was basically the same as +/- gear enmity, and not even a significant amount.

If they do make this plague spell, I hope that it not only is potent but works effectively on nms. In a round about way it could be seen as damage mitigation and a buff to curing potential.