Adze

Shadow Meld. The Adze can merge with shadows, becoming nearly invisible in Dim Light or complete Darkness. In this state, the Adze has the Invisible condition.

Last Light. Once per dusk if the Adze drops to 0 Hit Points outside its nest, the Adze uses Firefly Form to become a swarm of Tiny insects (no action required). If it can’t use Firefly Form, it is destroyed.

While it has 0 Hit Points in insect form, it can’t return to its Adze form, and it must reach its nest within 2 hours or be destroyed. Once in its nest, it returns to its Adze form and has the Paralyzed condition until it regains any Hit Points, and it regains 1 Hit Point after spending 1 hour there.

Adze Weakness. The Adze has these weaknesses:

Hallowed Ground. If a place has been blessed, the Adze is forbidden from entering.
Stake to the Heart. If a weapon that deals Piercing damage is driven into the vampire’s heart while the vampire has the Incapacitated condition in its resting place, the vampire has the Paralyzed condition until the weapon is removed.
Gold Vulnerability. If the Adze takes damage from a golden weapon, it takes double damage.
Sunlight. The vampire takes 20 Radiant damage if it starts its turn in sunlight. While in sunlight, it has Disadvantage on attack rolls and ability checks.

Multiattack (Adze Form Only). The vampire makes two Claw attacks and uses Nightmare Influence if available.

Claw. Melee Attack Roll: +9, reach 5 ft. Hit: 11 (2d6 + 4) Slashing damage. Upon a Hit, the Adze regains a number of Hit Points equal to half the Slashing damage.

Bite. Melee Attack Roll: +9, reach 5 ft. Hit: 8 (1d8 + 4) Piercing damage plus 7 (2d6) Necrotic damage. Upon Hit: Constitution Saving Throw: DC 17. Failure: Target suffers the Poisoned condition for up to 1 minute. After being Poisoned this way, the target experiences fatigue, night sweats, and vivid nightmares for the next 24 hours. The target can repeat this save at the end of each of their turns, ending the effect on a success.

Nightmare Influence (Recharge 5–6). The Adze can invade the dreams of sleeping (Unconscious) creatures within 300 feet of itself. Each night, creatures within this range must succeed a Wisdom saving throw (DC 17) or suffer from vivid nightmares. For the next 24 hours, an affected creature cannot benefit from the effects of a Long Rest, instead taking a Short Rest if one is attempted. After the 24 hours, a creature repeats this save, ending the effects on a success and gaining 1 level of Exhaustion upon a failure. If the Adze is slain, the effect is ended for all affected creatures upon their next Long Rest.

Fiery Allure (Recharge 5–6). The Adze appears as a swarm of harmless, glimmering fireflies for up to an hour. While in this form, it acts as a Swarm of tiny beasts, but uses this stat block. The Adze emits Bright Light in a 20-foot radius, and Dim light in another 20 feet. A creature that can see it must succeed a Wisdom saving throw (DC 17) or be affected by the Charm Person spell, requiring no spell components and the duration is 24 hours. The Charmed target must use their movent to get as close as possible to the Adze, becoming Unconscious if it starts or ends it's turn within the Adze's Bright Light, and remaining this way while Charmed. When the spell ends, the target is unaware it was Charmed by the Adze, and all information of the Adze it had learned within the previous week is forgotten.

Firefly Form. If the Adze isn’t in sunlight, it shape-shifts into a swarm of Tiny insects (AC 18, Speed 5 ft., Fly Speed 40 ft.) that emit Bright Light in a 20-foot radius, and Dim light in another 20 feet, or it returns to its Adze form. Anything it is wearing transforms with it.

While in insect form, the Adze can’t speak. Its game statistics, other than its size and Speed, are unchanged.