Z-040 pulse grenade

The Z-040 Attenuation Field Generator/Localized, also known as the Pulse grenade, is a thrown Forerunner weapon that functions similarly to traditional grenades.

Overview
The Pulse grenade was used by Forerunners to cauterize Flood strongholds composed of resilient Flood Super Cell accretions which quickly develop into a Gravemind. When inert, the Pulse Grenade is a box-like device with eight pyramidal projections and glowing yellow highlights. When thrown, its yellow patches invert into orange-glowing spikes, and it creates an area of effect that damages shields and health. It is designed to clear enemies from cover. Upon being thrown, it forcefully detonates and forms a hazardous ionization sphere which eventually collapses, destroying nearby targets. Its operation is similar in function to the Power drain equipment of Halo 3.

Trivia
In the Halo 4: Official Game Guide it is mistakenly portrayed as a star-shaped device with six spikes. In the Halo 4: The Essential Visual Guide, it is shown to be a more box-like device with eight spikes. This is presumably an oversight by 343 Industries.

List of appearances

 * Halo 4
 * Spartan Ops