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The Z-040 Attenuation Field Generator/Localized,[1] more commonly known as the Pulse Grenade, is a Promethean Forerunner grenade appearing in Halo 4Like most Promethean weapons, it is made from ionized particles. It is roughly cube-shaped with the appearance of a platonic icosahedron (a 20-faced polyhedron) with bright orange spikes on each corner of the face. When detonated, it releases a powerful pulse of ionized particles which forms a bright orange sphere.

The Pulse Grenade causes two explosions: once upon contact with any hard surface and again after a few seconds. Between these two pulses, it generates a spherical area-of-effect that slows vehicles and drains shields and health (similar to the EMP effect of the Power Drain). When killed by a Pulse Grenade, the target will disintegrate into orange particles of energy.


  • The Pulse Grenade is much more effective than other grenades at area denial.
  • One explosion is enough to completely strip a Spartan's shields or kill a Spartan with low shields. A single Pulse Grenade can kill a Spartan if the Spartan is impacted by both the initial and final explosions.
  • Vehicles that enter the orange glow are slowed down.
  • Because the Pulse Grenade detonates upon impact instead of bouncing, it is much easier to aim.


  • Players who choose the Pulse Grenade in their loadout will spawn with one grenade instead of two. Using the Grenadier Tactical Package will increase this to two.
  • The Pulse Grenade's orange glow is very noticeable and thus easy to avoid.
  • Because the Pulse Grenade detonates upon impact instead of bouncing, unlike other grenades, it cannot reach some areas by being bounced off of surfaces.





  1. 1.0 1.1 1.2 1.3 1.4 1.5 Halo Waypoint - Universe - Pulse Grenade
  2. Halo 4: Official Game Guide , page 47

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