Long story short, I recently pulled my second magic jewel pull, and I was lucky enough to get a Shiva. She comes with an SSR water staff.

However, I'm heavily specced into the mordred line already - I've finished maxing out Asmund and almost done with Rosenkreuz (the two elite soul prerequisites to Mordred). Mordred does not use staffs.

Is the benefits of wielding an SSR single element weapon great enough that I should respec into a heroic soul line that uses staffs? Or do I ignore the strongest weapon I've got, the only SSR weapon, and just continue along to Mordred, who I heard has some of the best afflictions available?

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Also, I've got a ton of the enhance weapon material cherub weapons. Do I spend them to boost one of my weapons? Do I hold them? I suspect they're useful for something besides exp fodder but I've no idea what.