The Alpha Naytiba Tachy is the eighth boss you encounter in that you must beat throughout three intense phases. This former partner turned enemy is a cold and calculating opponent, making them very different from the aggressive bosses you have already faced.
Only by paying attention to Tachy's movements and patterns will you have a chance at overcoming this relentless boss. Tachy is fought in Matrix 11 at the end of the quest after you've already faced other enemies like the Juggernaut. Equip your best gear in preparation for this fight since it is a hefty challenge signifying the end of this story section. Items that make Perfect Dodge or Perfect Parry easier and anything that increases your max health in are good tools to use.
Unlike many other bosses, Tachy takes a defensive approach to fight EVE, so be aggressive toward the start of the fight to land some hits before the boss begins to act.
Be careful though, as this strategy is used by Tachy to lure you into a false sense of security before they strike. When Tachy chooses to attack, their moves do far more damage than other enemies if you aren't prepared to parry or dodge.
As you can see in a video by Direct Gaming, you need to pay attention to whether Tachy performs a normal attack or an unblockable strike.