Overgrown c12 as a boss fight

Heavy loader

berserk loader

The prototype loader as a boss fight 

Bull loaders but carry a large bulldozer blade on their left arm like a metal shield and a pump shotgun on their right. BULL Loaders will occasionally ram its targets with the blade.

BUL Loaders have an impenetrable shield on their left arm and a powerful rifle held in the right hand. They are generally slow-moving, but have an ability to transform themselves into a miniature bulldozer and hurtle forward in a ramming attack. They are able to steer towards targets during the charge, and generally jumping over them is a common method to evade this.

If the gun arm is shot off, BULL Loaders will lower their shields to attack with a shock  blast from their optic sensor. This form of attack is also used periodically under normal circumstance with the gun still attached. If damage is dealt to their gun arm joint (without destroying it) the loader will rotate and extend its shield to cover the joint, but exposing its leg joints in the process. Shooting off the shield arm disables their charge attack. An effective way to deal with BULL Loaders is to destroy their gun arm with a pump shotgun, and then target its shield arm once it starts charging its eye blast. BUL Loaders cannot have their legs shot off. However, they are still critical hit locations

this is a Bulldozer form

Powerloader  or pwr loader of short, designed for heavy lifting, but can also use their powerful arms defensively and for melee attacks.

Powerloaders generally use their arms for melee strikes. When the Powerloaders  spots an enemy, it will open up its arms and start spinning them quickly as it advances, shielding the loader against attacks and deflecting bullets back at their attackers.

 If a target is close enough to a Powerloaders, the powerloader will stop spinning its blades and attempt to strike. With good timing, a player can step back to avoid the blow, and then take advantage of the loader's now-unprotected shoulder joints. When the target is too far away, the Powerloaders may stop spinning its arm and use its electric blast attack instead, opening itself to attack in the process. Another option is to shoot their unprotected legs directly or with explosive splash damage, this can also make them flinch and stop spinning. Their legs cannot be shot off but the joints are critical hit points (similarly to bull loaders ). Their optic sensors are partially shielded by their spinning arms, therefore it is possible, although difficult, to shoot it. A successful shot on the optic will disrupt the spinning arms and stun them, giving a long opening for attacks.

Assault loader

minigun can switch to grenade launcher 

Overgrown c6 and loader

Sniper c6