Hunt Down the Hydra Tanks is a mission in A Crack in Time, taking place in Krell Canyon on planet Lumos. Ratchet and Alister Azimuth had to repel an invasion by the agorians on a vullard settlement to get one of the vullards to tell them the location of the temple containing the Obsidian Eye. Having first defeated five agorian riders, the invaders sent in a pair of Hydra tanks.
Walkthrough[]
Alister will not be on the battlefield for this mission, instead providing aerial support in the form of strafing runs (although these do not inflict a lot of damage). One of the Hydra tanks is in the northwest of Krell Canyon, and the second is on the eastern side. It is recommended to ignore both and find a vendor to restock first.
If you are at the location of the fifth rider from "Destroy the Agorian Riders", then head northwest to reach a hazardous area with several accelerator ramps to find a weapons vendor, as well as a battery bot. You can use the bot to unlock a nearby gate to find the Rapid Trigger mod for the Constructo Pistol.
Hydra tanks, when attacked, will either spin around while emitting a beam of fire from all of its 'heads', or face towards you and continuously spit fireballs. Neither of these attacks are hard to avoid, so focus on that while returning fire with your weapons of choice. Upon losing 33% of its health, a Hydra tank will activate an impenetrable shield, which you need to disable by using the kinetic tether to remove one of the exposed versa-fuses. This also destroys one of its heads, actually making it weaker in the long run.
The only other threats, other than the Hydra tank's bulk as it can run you over, are agorian reinforcements. Upon destroying both tanks the mission immediately ends, leading directly into the follow-up mission "Eliminate Agorian Air Support".