Plasma mortar

The Plasma Mortar is a Covenant vehicle-mounted ground weapon.

Exclusively outfitted on Wraiths and Brute Wraiths, the plasma mortar fires huge balls of slowly moving superheated plasma with a large explosion radius and slow rate of fire. It is extremely powerful and kills in a single hit.

It uses indirect fire meaning that it can be fire to just about anywhere on a battlefield without worrying about obstructions such as hills etc.

A giant stationary plasma mortar was seen destroying buildings in the halo 2 e3 demo video. Sergeant Banks called HQ and 3 Longsword fighters nuked it.