The tank itself is basically a low chassis propelled by screws, with a laser cannon jury-rigged to the drill tower. Originally, it was a mining rig. The Chimera's turret cannot fully rotate, making the back of the tank a weak spot, similar to main battle tanks.
The player character may encounter Chimera tanks twice throughout the campaign, a pair off in the distance during The Guns of Anchorage and at the fuel depot during Paving the Way. Only one chimera is ever actually fought, serving as a miniboss at the fuel depot. Walking into a Chimera while crouching will knock the player character down, causing damage.
Chimera tanks are described as being superior to any American tank available and are roughly on par with sentry bots and deathclaws in terms of durability and combat threat, although they are significantly larger. They are equipped with a unique laser weapon similar to Liberty Prime's eye laser. Chimeras take slightly increased damage when shot in the screws and noticeably increased damage when shot in the cannon or radar antenna.
↑ 1.01.11.2Lone Wanderer:"What exactly IS a Chimera?" Thomas Morgan:"Put simply, it's a co-opted mining rig that's been changed into an armored vehicle -- bigger and tougher than any tank we have in our arsenal. The Chinese fitted the vehicle with multiple weapons, reinforced the armor and outfitted them for long range." Thomas Morgan's dialogue