The Gray Knights are knights loyal to the King. They are the bulk of his army and assist you on Barbarian War and Flowery Field. Also the visor being lifted proves that all knights are people, even the four main knights.
The Open Faced Gray Knight is not seen in any part of the game. He is available for download in the King Pack for $1.99 in the Xbox 360 version or unlockable in the PS3, and PC version for defeating the Catfish in Insane Mode.
Arrows rain down from the sky to in front of the character in sets of three. Each upgrade level adds another set of three arrows. There's a small delay but the player can adapt to it easily since the delay isn't that big.
Use / to perform. This attack pierces armor, and it deals two times normal damage. That means it deals as much damage to a Barbarian or Thief on normal mode as it does to a Stoveface or Cultist on insane mode.