Lightning Attack specifically rules out combining it with Dual Strike. I was wondering why this was so. Considering the considerable talent investment to get both, it doesn't strike me as that overpowered, especially since Lightning Attack doesn't rule out using it in combination with Two-Handed weapons, which tend to do almost as much damage as two-weapon fighting, if not more.
For example:
With Two Weapon Wielder (Melee), and Dual Strike with two chainswords, you make one WS test to deal 1d10 +2 + STR at pen 2 twice.
With Swift Attack and Lightning Attack and an Eviscerator, you can make three separate attacks each of which deals 2d10 + 3 +STR at pen 5.
The second option should yield far more damage on average, it seems, while if you were hypothetically to allow the TWF character to use Lightning Attack they would gain a couple more times their STR bonus at the cost of a bit of penetration. That hardly seems like a huge benefit in light of the high talent cost.
Anyone have thoughts?