Anything funny or serious. It doesn't matter. I just want to get a discussion going. I would like to see something like the arc cannon or "gravity cannon" from District 9. Another idea I had is called the "Time Rifle." When you shoot it at an enemy, he's forced into a slo-motion state. It's sorta like the slow-time shout in Skyrim except only the target is slowed down. You can either mow em down with a gun and he dies in slow-motion or you go in for the kill and do an awesome hand to hand finisher.
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Grappling hooks and lots of differnet vehicles with various custom weapons and paint jobs yes