Shua'ee-pattern Locust

"Destroy those Locusts wherever you find them. They're building killers!"

- Sergeant John Forge

The Type-30 Light Excavation/Anti-Fortification Platform, more commonly known as the Locust, is a quadrupedal Covenant vehicle used for mining and combat purposes.

Design details
The Locust is a smaller, tank-sized counterpart to the Scarab, which is also a repurposed mining platform. It does not share the Scarab's spiked 'feet', though it is capable of using its legs to climb over obstacles in a similar manner to its larger cousin. Like T-47B Scarabs the Locust is piloted by a Sangheili, Jiralhanae, or Unggoy pilot while a Lekgolo colony forms the musculature and control systems. The Locust possesses one rotating turret, which is very similar in appearance to a Type-26 Banshee's cockpit. The turret houses a single plasma cannon that fires a linear pink beam; this beam is effective against both ground and air targets and can outrange most equivalent weapons. The Locust has a regenerating shield that is capable of protecting the vehicle from a limited amount of weapons fire. The Banished utilize modified Locusts armed with unstable focus cannons, making them more dangerous than their Covenant counterparts.

Operational history
"They should start calling me the Locust of doom!"

- An eager Unggoy Locust pilot during the Battle of Installation 00.

In February 2531 Locusts were used by Covenant forces on Arcadia and Shield World 0459 in long-range artillery roles against UNSC forces. In the post-war era, remnants of the former Covenant empire still used the Locust, though their roles have somewhat changed: while some are employed by fierce Jiralhanae raiding parties looking to pillage colony worlds, Sangheili kaidons and warlords used them to fortify keeps and protect fragile alliances. In April 2559 Banished forces used Locusts against the crew of the during the Battle of Installation 00.

Halo Wars
The Locust has the longest effective range among the Covenant ground units in Halo Wars and costs 300 resources, a tech level of 2, and a population space of 2. The Locust is specifically designed to take down static targets, and is only able to open fire when stationary. The Locust can be upgraded with the 'Overdrive' ability as well as with the 'Shield Amplifier' ability. The former upgrade allows the Locust to divert energy from its shield generator to its main cannon, increasing its attack power; the latter upgrade allows the unit's shield to regenerate faster.

Known as a 'building killer', the Locust is largely used to attack an enemy's defenses from a safe distance. This is a useful alternative to a direct confrontation, which would result in casualties for the attacker. A small group of Locusts can be used to assist a force of smaller warriors, like Kig-yar, making it far easier for the group to destroy enemy buildings. Larger groups of Locusts can be used in surprise attacks against enemy bases and in such cases, the Locusts can often level the targeted base in thirty seconds. However, the inherent vulnerability of the unit makes this a gamble. The Locust is fairly weak against non-structure targets. Though it is able to do significant damage to units, the Locust's defences are weak and falls quickly to concentrated fire. However, its beam can lure enemy units towards awaiting forces, allowing them to be quickly cut down. Although less common, the Locust can be used quite effectively to destroy small groups of air units such as a formation of vultures. This is provided the the player has a sufficient number of Locusts and that they attack from long range to reduce the amount of casualties that will inevitably be taken.

The following upgrades are available:
 * 1) Overdrive is a special attack that drains the Locust's shields to boost damage. Requires 400 resources and a tech level of 2.
 * 2) Shield Amplifier increases the Locust's shield-regeneration rate. It is useful when used with Overdrive, and its effects also stacks with the 'Shield of the Forerunners' upgrade from the Temple, allowing for an even quicker regeneration rate. Requires 800 resources and a tech level of 3.

Halo Wars 2
Locusts can be built at the Banished Foundry by all Banished leaders. Locusts perform well against structures, okay against infantry and vehicles, and poorly against aircraft. In Blitz Locusts cost 40 energy, Bloodfuel Locusts cost 80 energy, and Enduring Locusts cost 90 energy. Bloodfuel Locusts siphon health from enemies while Enduring Locusts will spawn Grunt squads when it is destroyed.
 * Info: Anti-Building, Sustained damage, Long range, Weak armor
 * Tier: 2
 * Cost: Population 4, Supplies 250, Power 75

Trivia

 * Like the Scarab, the Locust is named after an insect. Locusts are members of the grasshopper family that are infamously known for rapidly stripping fields of crops. The walker's similar "building killer" usage may be the reason for the vehicle's name.
 * When playing as the UNSC in multiplayer or skirmish modes, Serina may say, "Watch the skies — they've got Locusts." This, along with the Locust being first encountered in-game in a mission where other attacking enemy units are airborne, and the real locust being able to fly, may mean that the Locust was an air unit at some point in the development of Halo Wars.

List of appearances

 * Halo Wars
 * Halo Wars 2
 * Halo: Envoy