No, a Master Riposte attack would be a fair bit more effective than a Lightning Field...
Accuracy though, I guess if you include Lighter than Wind for Brona, it's equal.
What I meant is that Feat+Lightning Field Countershot is gonna equal Master Riposte+At-Will Damage if you play your cards right. If nothing else, because that feat could be Master Riposte itself.
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Twostuck, Homestuck RPG: http://www.gamefaqs.com/boards/8-gamefaqs-contests/62168402