Eklon'Dal Workshop Antlion
From Halopedia, the Halo wiki
During the Second Ark Conflict the Banished deployed mega turrets as a straightforward anti-siege weapon at war camps which had the necessary infrastructure and permanence to support their use. They were employed by the Jiralhanae Pavium during the Flood outbreak on Installation 00 to combat the parasite and eventually kill the forming Proto-Gravemind.
Halo Wars 2
Mega Turret Upgrade: Lingering Death
Mega Turret Upgrade: Compound Detonators
In Halo Wars 2 the mega turret is a base slot structure exclusive to Pavium once the player has used a leader power to unlock it. Unlike its Halo Wars counterpart the mega turret in Halo Wars 2 is automated similar to the Banished Spike turrets. Pavium himself is able to highlight targets with his target locator though. Also like the Spike turrets, the upgrades apply only to the individual turret that was selected, except that it can be upgraded from War Council. With long range and heavy damage mega turrets are excellent for fighting infantry, vehicles, and even other structures, but they cannot attack aircraft. The only flaw is that due to the size of the turret, it cannot be constructed on Turret slot, and players have to sacrifice one of their building sockets to construct a Mega Turret.
The Mega Turret is a popular choice for those who pick Pavium in Terminus Firefight to strengthen defenses, as it is able to cover a wide range that is larger than the UNSC Siege Turret.
In gameplay, the Mega Turret plays an important role in the level Manifestation where it is used to attack a Proto-Gravemind's tentacles and then the creature itself. In this case, the player only has to construct a Banished Minibase which will automatically be constructed with a Mega Turret already in place. The player has to spot the target of the tentacles and Proto-Gravemind for it to successfully work, however.
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