The XR-004 Allure is an energy-based grenade launcher predecessor to the Splitter.
Standard fire will launch small timed grenades at a slow rate that deploy shortly after it is fired. Secondary fire mode charges the grenades, giving them a magnetic-like property, much like a Plasma Grenade, that stick to surfaces and enemies resulting in an instant kill. It is exclusive to Resistance: Retribution. This weapon is unlocked after acquiring all "Cloven Lore" intel.