|Fully grown Vessel, carrying the plague's heart within its body.|
|The Old King of Hallownest... he must have been desperate to save his crumbling little world. The sacrifices he imposed on others... all for nothing.|
The Hollow Knight is the Vessel that sealed away the Infection. It is one of two final bosses of the game.
Upon breaking the seals on the temple by destroying the three Dreamers, the player is allowed entrance in order to fight this boss. To begin the fight, the player must break the four chains holding the Hollow Knight.
The Hollow Knight has multiple moves:
Phase 2 is announced by the Hollow Knight screeching loudly, stunning the player. During the second phase of the battle, the Hollow Knight gains some new attacks on top of the old ones:
The third phase is announced by the Hollow knight screeching loudly yet again. Depending on the player's progress, the fight will be interrupted by Hornet, allowing player to access its mind with the Dream Nail and fight The Radiance, otherwise the fight will continue as normal. During the thrid phase of the battle, the Hollow Knight gains one new attack on top of the old ones:
The main weakness of the Hollow Knight is that they are vulnerable to attacks from above. During a Nail Lunge or Combo, jump above their head and Nail bounce a few times while they finish their attack. If they try to Parry, simply dash away before they counter-attack.
While seemingly random, during Infection Shot and Infection Barrage there is a pattern to the blobs, so pay attention and move into safe zones. Dashing can often overshoot a safe zone, so walking is usually safer.
During Engorged Slam, they will home in on the player nearly perfectly if moving in one direction, but will have trouble tracking if the player constantly changes direction. Don't run away, instead dodge the first slam, then dash under them when they rise for a new slam, then reverse again after they come down and repeat.
During Infection Pillars, the pillars will briefly charge on the floor before erupting, showing where it's safe to stand. When the Hollow Knight jumps and readies their Nail, start looking for a safe zone immediately after dodging the downward strike.
The Hollow Knight's Teleport will usually position them far away from the player, so using Vengeful Spirit/Shade Soul during this time is useful to get hits in before they charge another attack. Moving too far from the Hollow Knight makes them more likely to teleport close to the player, so be careful running away to heal.
- It is unknown as to why the Hollow Knight begins to stab themself halfway through the fight. It could be trying to help the player by attempting to kill theirself, or they could be trying to further increase their strength by opening up the Infection more, in an act of desperation. It could also be going mad and trying to destroy the Infection that's slowly taking it over.
- It is explained through NPC dialogue that the Hollow Knight could not contain the Infection due to an unnoticed flaw which caused the them to not be "completely hollow."
- It is implied that, in the first ending ("The Hollow Knight"), this will also happen to the player - they also failed to become completely hollow, and eventually the Infection will leak through once again.
- In the Sealed Siblings ending, the player is noted by the White Lady to have become truly hollow due to acquiring the Void Heart, and thus able to fully contain the Infection. Whether this is actually true or another assumption that could be proven wrong remains unknown.
- During the scene in The Abyss, before the player receives the Void Heart, a Vessel similar looking to The Knight is shown exiting the Abyss with the The Pale King. Judging by the shape of its horns, it seems that it's the same Hollow Knight fought in the Black Egg Temple. It also looks at The Knight before following the Pale King out. This also could hint towards the original not being completely hollow, as it displayed some form of sympathy or sadness.
- It is unknown if the Hollow Knight has a second arm, as they performs most of their actions with just one arm, and never show a second arm during the battle. Their Shade, however, appears to have both arms.
- During the ending sequence of The Radiance fight, the Hollow Knight's shade appears and opens up a weak point on her head, allowing the player to land the finishing blows.
- The Hollow Knight has cut Dream Nail dialogue which are the following:
- ...Shall blaze free...
- ...This Vessel, broken...fails...
- ...Dawn...Shall break...
- ...No mind, the usurper...Only strength...
- ...Kill the usurper...Our light it would suffocate...