Type-2 spike grenade
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This article is about the Jiralhanae grenade. For the similarly named Jiralhanae gun, see Type-25 Spiker.
The spike grenade is one of two grenade types designed and used by Jiralhanae forces in the Covenant military. Unlike the more common plasma grenade, which adheres only to living targets using a layer of plasma, the Spike Grenade uses numerous razor-like quills to seemingly be able to grip to any surface including rock, glass and energy shielding. Notably, the power armor employed by Jiralhanae Chieftains is capable of repelling a spike grenade's adherent mechanisms.
After collision, the grenade detonates, sending a cluster of super-heated metal spikes flying at a perpendicular trajectory to the surface the grenade has stuck to. The mechanism operates similarly to the UNSC M383C Linear Shaped Charge Demolition Kit. Upon detonation, the shrapnel emitted by the spike grenade reaches a temperature of approximately 270 to 315ºC and retains that heat for upwards of seven seconds. These spikes will ricochet off of hard surfaces, making the grenade a deadly weapon against enemies in confined spaces. The focused direction of the spikes renders the grenade slightly less effective in open areas. The mechanism by which the explosion of the Type-2 is directed is similar to that of the M383C Linear Shaped Charge Demolition Kit. 
Even being hit by a thrown spike grenade can cause serious injuries akin to being "run through by a mini-baseball bat with nails sticking out of it". However, the device arms on impact, and invariably detonates before it can be extracted from a body. Some UNSC personnel believe that the spike grenade's injuries are designed to be fatal—not to force the enemy to spend time and resources treating casualties, but to make a victim die screaming.
The spike grenade is similar in appearance to the Model 24 Stielhandgranate grenade used in the 20th century. However, it derives its namesake from the spikes on the grenade (four curved spikes on top and twelve smaller ones around the shaft) as well as the shrapnel it expels. The outer casing is constructed of an unusual porous metallic compound, though some UNSC personnel have commented that the weapon's look is deceptive and - while still heavy - the grenade is lighter than it appears to be. The spike grenade bears a heavy visual resemblance to the Brute landmine.
Spike grenades were first encountered by UNSC forces during the First Battle of Harvest in 2525. Like most Jiralhanae weaponry, they became much more prominent during the onset of the Great Schism in 2552, and were widely employed by loyalist forces of the Prophet of Truth during the Battle for Earth and Battle of Installation 00. The UNSC would eventually capture some samples of Spike Grenade weaponry and test them at Outpost C9 and the Covenant "Snowbound" facility, leading it to becoming one of many weapons and vehicles featured in the report Machines, Materiel and Munitions from the Human-Covenant Conflict, 2525 - Present.
This grenade is very effective in suppressing enemy movement in closed environments. Unwary combatants can be mowed down easily by a hail of spikes. The grenade can also be used against vehicles, surprisingly doing more damage than plasma grenade and frag grenade.
List of appearances