Z-390 incineration cannon

The Weapon/Anti-Materiel Z-390 High-Explosive Munitions Rifle, also known as the Incineration cannon, is a Forerunner anti-matériel weapon originally used to combat the Flood.

Overview
The Incineration Cannon was often used to strategically purge infected sites. Prometheans used the Incineration Cannon when assaulting a location believed to contain a Gravemind, or early-forming spore mountains, that were deemed too small for ship weapons but too large for infantry weapons. The Incineration Cannon fires five antimatter-infused streams of concentrated explosive particles, which gather into globular projectiles that oscillate along a straight trajectory. The projectiles detonate and spread upon impact with a target, ricocheting and bouncing in tall but short arc trajectories. It initially holds five whole charges at a time with one shot per charge. Each charge is automatically "loaded" after firing and cool-down. It has been described as "mixing traits of a rocket launcher, shotgun, and flamethrower."

Design details
The weapon possesses an angular design and a metallic casing. It appears to be held together, at least partly, by energy fields as indicated by its self-assembly process and reloading mechanics. Red highlights can be seen while the weapon is self-assembling and throughout the casing once assembly is complete; these highlights grow brighter when the weapon is fired. The weapon also features an integrated optical scope for targeting accuracy.

Tactics

 * Similar to its UNSC and Covenant counterparts, the Incineration Cannon is best used when shooting the ground in the close proximity of an enemy.
 * In encounters with M808 Scorpion and Type-26 Wraith tanks, players can inflict maximum damage by shooting at their underbellies . This will greatly increase the likelihood that the shot's secondary explosions will strike the target.
 * Of all the heavy weapons, the Incineration Cannon is the most effective against the Mantis. A single direct hit on the Mantis's cockpit will destroy it; all other heavy weapons require at least two hits.

List of appearances

 * Halo 4
 * Spartan Ops