Alright, well if nobody else is going to light the fuse on this dumpster fire of a marketplace of ideas, I guess I'll have to take matters into my own hands: GENTLEMEN, BEHOLD!
[prinz eugn softly weeping in the distance]
Holorail
ONI's skunkworks rail-mounted holographic projector. Sends a Hologram decoy in shape of the user to a determined point based on line-of-sight, while Smart-link causes the decoy to Sprint at full speed for a short amount of time before dissipating. Charging the weapon causes the decoy to remain stationary on appearance. Hologram will fail if it sustains enough damage.
REQ variations:
Doppelgänger
I don't know which one to shoot! Modified Holorail that fires decoys with moderate homing capabilities; physical contact with a Spartan (alive or dead) will cause the Hologram to vanish and release an EMP effect as well as lingering damage around the area of impact. More than one Hologram can be active at once.
The Hollow Men
Cut out the middleman and bring the light to them. Dramatically altered Holorail that exclusively fires sprinting decoys made of Kinetic Bolt condensations that will displace and damage vehicles in its path. On time-out or failure, the Hologram generates a powerful explosion with EMP effects. User is granted poor Active Camo while a Hologram is active.