Xero

Xero is a Warrior Dream boss in Hollow Knight.

Lore
Xero was a warrior of Hallownest who believed that strength would always allow him a bright future. When his mind was infected, he hoped to fight against the plague with violence. Fueled by the same hope, he turned against the Pale King, for which he was executed. Xero was buried in the Resting Grounds, his tomb a reminder to any who would betray the King. When his ghost awoke, he still could not see the wrongness of his actions and believed instead his demise to be the result of a doomed fate.

Hollow Knight
Xero's ghost appears to the Knight once they have acquired the Dream Nail. He accepts their challenge to mock his own fate. Once defeated, Xero finally acknowledges that his actions against the King were irrational. The ghost confides to the Knight its faith in their bravery, before shattering in 100 Essence to be collected by the Dream Nail.

Behaviour and Tactics
If the Knight stands slightly away from Xero when they fire their nail, then dashes to directly below them in the first phase, the nail can be easily avoided.

The Knight can heal easily by running off the platform and to the far left of the area, where Xero's attacks will not reach, or by running under the platform. Note that this is not possible when fought in Godhome.



Trivia

 * His grave message used to read "Here lies a Traitor", which was changed to the current message after the public release version 1.0.2.8.
 * This has, however, not been changed in some translations of the game.