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verry cool build..... assasins creed style :P
only fault i could pic up on (donno if its already been pointed out) is your spell rotation, you said to use lightning, weakness, nightmare, blessing, frostbite
i suggest using blessings first... blessing of might increases crit chance by 50% and makes all the spells in the rotation alot more effective.
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You should really use debuffs before any damage skills (like lightning). It will make them more likely to hit and they will do more damage.
I'd go buff->weakness->nightmare->lightning->drain (if you have it)->ice/frost->fire