I'm trying out the expensive combination tomorrow night, Archon with WWP, Shadowfield, agoniser and Blast Pistol joining 5 scourges with 4 Heat lances, and a solarite with blast pistol and power spear. Yes I know it's a hell of an investment, but the game I'm playing is 1250 so this unit becomes my main AT choice. Added to which, the shadowfield on the Archon will help to protect against return fire (I'm under no illusions it will stay working for too long though) and the combination of AP1 assault fire with two power weapons in the following combat should give the unit a bit of redundancy.
I'll let you know how it goes...
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