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So I'll be honest I don't play empire. But lately I discovered Turin vids so I've been watching lots and lots of matches including some high level ones and I've never seen empire players take the helblaster gun, only the ROR war wagon one. And when I've played against the empire, I've never seen anyone take it either. And from campaign experience, even with all the AI exploits, it was hard to get usage out of. It gets obstructed and is too slow for repositioning. Damage potential is definitely very high if used right, but IDK if for all the cons the cost (1150) is justified. Basically every other empire artillery gets used instead.