Xero

Xero is a warrior spirit who can be fought in the Resting Grounds.

Attacks
Xero will initially spawn 2 nails of light next to them. These nails will home in on the player's location and then fire, but will not track after they are initially set in motion.

Once the nail is fired, it will return to them several seconds later, like a boomerang.

Once enough damage is dealt to them, Xero will spawn more nails and fire two in quick succession.

Tactics
If the player 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 player can heal easily by running off the platform and to the far left of the area, where Xero's attacks will not reach.