The old-world style and intricate details of of Tex Mechanica (they made The Last Word and The Chaperone) applied to a high tech energy weapon like a fusion rifle would look amazing. It would make a cool exotic weapon for an expansion or sequel, and it could be called [b]The Phantasm[/b].
I imagine it could look like a much shorter and more embellished version of [url=http://i1.wp.com/twinstickgaming.files.wordpress.com/2014/04/the-order-arc-gun.jpg]THIS[/url] gun.
The exotic bonus could be something like "kills with this weapon dramatically increase range and charge rate for a short time," or anything the designers feel would be would be balanced.
[spoiler]~stylish gun twirl~[/spoiler]
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The Phantasm is an enemy of Batman