Neurotic life. When the Hollow knight takes neurotic damage it's gains hit points equal to half the damage. If the attack is a critical hit it gains the full number of hit points.

Undead vengeance. Once the hollow knight reaches half hit points it grows one size larger and gains the following traits. It's armor class increases to 21, it gains 40 hit points, all attacks deal an additional 4d6 neurotic damage. The hollow knight gains a army of undead. The undead army has a collective hit points of 60 (1 hit point per-minion). Each minion has a AC 15, and deals 1d8 slam attack. They attack on initiative count 20.

Spellcasting. The Hollow knight is a 7th-level spellcaster. Its spellcasting ability is charisma (spell save DC 18, +6 to hit with spell attacks). The Hollow knight has following sorcerer spells prepared:

Cantrips (at will): chill touch, shocking grasp, ray of frost, blade ward, true strike

1st level (5 slots): fogs cloud, ray of sickness, shield, sleep, witch bolt

2nd level (4 slots): crown of madness, darkness, hold person, invisibility

3rd level (3 slots): dispell magic, fear, gaseous from

4th level (3 slots): dimension door, polymorph, wall of fire

5th level (2 slots): animate object, insect plague, seeming

6th level (1 slots): chain lightning

7th level (1 slots): finger of death

Undead vengeance. Once the Hollow knight reaches half hit points it grows one size larger and gains the following traits. It's armor class increases to 21, it gains 40 hit points, all attacks deal and additional 6d6 neurotic damage. The Hollow knight gains a army of undead. The undead army has a collective hit points of 60 ( 1 hit point per- minion). Each minion has a AC 15, and deals 1d8 slam attack. They attack on initiative count 20.

Blood blade. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 69 (10d6 + 18) slashing damage. 

Lantern of hollow. RangedWeapon Attack: +5 to hit, range 60/100 ft., one target. Hit: 41 (18d4 +11 ) neurotic damage.

Soul feast 5-6. The Hollow knight draws life force from his lantern gaining 10d4 hit points. The Hollow knight is only able to take this action if it's holding the lantern.