Xero

Behaviour and Tactics
Xero initially spawns 2 nails of light that shoot at The Knight but will not track them once set in motion.

After several seconds the nails return to Xero. Be careful as they deal damage on the way back as well.

Once enough damage is dealt to Xero, he spawns four nails and fire two in quick succession with every attack.

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.

Trivia
Ксеро
 * Xero comments that he thought strength would grant him freedom, and mentions dreams of cutting the plague with his nails. This suggests that his rebellion against the King may have been orchestrated by the Radiance, by manipulating his dreams and granting one great strength in return for one's will.