Watcher Knight

The Watcher Knights can be found in Watcher's Spire before the lift leading to Lurien the Watcher. From their name and Dream Nail dialogue, they were presumably tasked with guarding Lurien. However, by the time The Knight reaches them, none of them are left alive. They are reanimated by infected flies when the Knight approaches them.

Behaviour and Tactics
The Watcher Knights have three attacks:
 * Double Slash: Watcher Knight will swing their giant nail twice. Watcher Knight will swing horizontally first and follow it up with an overhead slash. Watcher Knight does move forward slightly with each swing.
 * Roll: A Watcher Knight curls up into a ball and rolls along the floor of the arena until it hits the opposite wall. They are immune to Nail attacks while rolling, but can still be damaged using Spells.
 * Bouncing Roll: Watcher Knight curls up into a ball and bounces twice. When they do this attack, Watcher Knight will attempt to target The Knight, which can mean that Watcher Knight may simply bounce in place rather than travel around the arena. The first bounce takes Watcher Knight to the top of the arena and the second bounce takes them only to the middle. Similar to the Roll attack, they are immune to Nail attacks while bouncing, but can be damaged using Spells.

There are 6 Watcher Knights total and the fight will start with only one Knight being reanimated. Once the Knight has been active for too long without being defeated, a second knight will be reanimated joining the first. However if the first Knight is killed quickly, then two of the next Knights will be reanimated together. Note that only a total of two knights can be active at once.

Since the Watcher Knights attack in groups, it's best to not get cornered by them. To prevent this, jump above them and hit them from the air, as their spinning jump is their only counter to aerial attacks.

Since they have fast attacks, Quick Focus is highly recommended for this fight. Another tactic is using Lifeblood Cocoon Charms for a health boost, and Stalwart Shell to increase invincibility time, then damage-race the Knights down while face-tanking their attacks.

Directly left of the arena there is a breakable ceiling (accessible via Mantis Claw) which reveals a secret area containing the anchoring of a chandelier. Striking it with the Nail will drop the chandelier, crushing one of the corpses below and permanently reducing the amount of reanimated Knights from 6 to 5.

Trivia

 * Three Watcher Knights can be seen in a piece of promotional material.
 * The Watcher Knights were the sixth boss to be revealed through the Kickstarter under the name of "Black Knight". This fact may have pointed to there only being one knight.
 * In an early development map only one "Black Knight" (Watcher Knight) could be seen labelled.
 * Team Cherry has stated that the Watcher Knights were intended to be stationed all around the City of Tears and act as a sort of "mini-boss".
 * The Watcher Knights are one of few bosses to have multiple entities attack the player, the others being the God Tamer, Mantis Lords, Oblobble and Brothers Oro & Mato.
 * After the Lifeblood update, the bodies of the inanimate Watcher Knights have been rearranged.
 * The inanimate bodies can be Dream Nailed for Soul before the battle starts, as well as struck with the nail. This object behaviour is similar to the empty armour of the False Knight.
 * Prior to 1.2.2.1 the Watcher Knight had an ability to Back-roll to evade attacks, this has since been removed for unknown reasons and could possibly be a bug.

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