Originally a regular laser RCW, it was found by Paladin Luxus and heavily modified, but he was forced to leave it behind after leaving the Brotherhood. It was then found and used by other Brotherhood Paladins, like those of Easy Company, and was possibly used by the Courier. After becoming a cyborg, Luxus (now calling himself Luxiga) somehow reobtained the UVAR and began using it again.
Compared to the laser RCW, it has an additional scope, the green lights are now violet, the wood is darker, and the Brotherhood of Steel logo was added on the stock.
It has slightly less health than the laser RCW and weighs more as well. It comes with a 2.6x scope and already has a laser RCW recycler installed. The UVAR has two distinct firing modes that it can switch between at any time:
In infrared mode, it operates almost exactly like the laser RCW, firing fully automatic and recycling every fourth shot, for 80 shots per reload. The only difference is a higher critical chance, double that of the laser RCW.
In ultraviolet mode, it fires semi-automatically, only recycles every fifth shot, and uses three ammuntion per shot, bringing it down to 25 shots per reload. Despite this, it deals 20 extra damage, has half the spread, more critical damage and its laser attacks are invisible to most enemies. This allows it to act as the only stealth energy weapon.