Holy Shield versus Lightning Shield

[Drasca]

There just isn't any justifiable reasons as to why one would get +spell damage and the other would not. 
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Have you ever considered the existence of nature spell resistence to Lightning, whereas, there's no known way to resist Holy? I can think of alchemy item that absorbs it, but extremely little.

In terms of world pvp, I remember chatting with Alliance buddies that would carry nature protection potions around (fairly cheap to make or purchase) to absorb incoming shaman blasts. While I've seen holy prot pots, there's still resistence to nature and not holy damage.