Herd machines that will bolt when disturbed, so they must be dealt with silently or quickly.
Use fire arrows to shoot the canister on it's back to cause a big explosion, which can also damage surrounding enemies. Melee still works well too if you already have the "Override" ability.
Hard outer casing to protect synthetic muscle and operational systems.
Blaze storage canister. Shooting elemental canisters with elemental ammo triggers an explosion that will damage everything nearby. Shoot off this component to collect the resource inside.
Horizon: Zero Dawn in PS4's Virtual Cinema