The Turret is an Arch-Gun known as "Arquebex", and is equipped on both arms of the Voidrig while this ability is activated. The fourth and final ability of the Voidrig is "Guard Mode", costs 50 energy, and allows it to anchor itself to the ground and deploy its Turret.
Gravemines are useful for dealing with swarms of enemies or setting a trap for an incoming pack of foes to run into. They will also self detonate after 2.5 seconds. These mines detonate on contact with enemies dealing 200 damage and triggering a guaranteed heat status effect. The third ability of the Voidrig is called "Gravemines," costs 75 Energy, and deploys a number of mines determined by ability rank (8 / 12 / 16 / 24) in an area around the Necramech also determined by ability rank (5 / 6 / 7 / 8 meters).
Storm Shroud is tremendously useful in improving the survivability of the Necramech in combat situations. When attacked while active, the Voidrig has a chance determined by ability rank (25% / 50% / 75% / 100%) to reflect the damage back to attackers. When first activated, the Buffer is invulnerable for 3 seconds and any damage it takes is multiplied by an amount based on the ability's rank (100% / 125% / 175% / 250%) and added to the Buffer's HP. The buffer starts with a flat amount of health that increases based on the ability's rank (400/600/800/1200). The second ability of the Voidrig is "Storm Shroud" which costs 50 energy and deploys a reinforcing buffer of health that must be depleted before damage can be dealt to the Necramech itself.
RELATED: Warframe: How To Catch Rare Fish On Plains of Eidolon This can be useful for controlling the flow of enemies, dealing with groups, and taking better advantage of choke points. If the canister is shot in the air instead of being left to detonate manually it detonates dealing radial blast damage. The first ability the Voidrig can make use of is called "Necraweb", costs 25 energy, and hurls a canister of gravitation fluid that creates a large globe-like area that slows enemies entering it by 50%.