As the name would imply, it is a dual element blaster, fire and shock. It shoots beams of shock and impacts with fire. It looks like it has a small AoE, but I haven’t really tested if it has extra splash. Overall, seems useful on athena because fire and shock DoTs on one weapon can be pretty cool with the whole maelstrom thing.
I got a few of the legendaries from someone in a lobby today. If you would like an idea of what they do, just ask.