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The Stationary Plasma Mortar[1][2][3] is a piece of ground-based Covenant field artillery.
It fires bolts of plasma similar to those of the Wraith tanks in indirect parabolic trajectories. Even a single impact is extremely damaging.
Appearances
Halo 2 E3 Demo
The Stationary Plasma Mortar was first seen in the Halo 2 E3 Demo. When the Covenant invaded Mombasa, they stationed a handful of stationary mortars on the ground, which demolished UNSC buildings. Eventually, SPARTAN-117 encountered one, and Sergeant Banks called in a Longsword airstrike to destroy the stationary mortar.
Halo 2
The roles of the Stationary Plasma Mortars as an active part of the Covenant assault were greatly downgraded in Halo 2, as the entire First Battle of Earth was downgraded. The Covenant appearantly placed several stationary mortars on the beachheads of New Mombasa, but did not fire them.
Halo 3
The Stationary Plasma Mortar was seen briefly in a reworked format in the Halo 3 E3 2007 Trailer. One under control of the Covenant Loyalists was stationed on an African cliff and shot down a nearby Longsword starfighter.