Adze (5e Creature)
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Medium undead, lawful evil
Saving Throws Dex +5, Con +5
Shapechanger. The adze can use its action to polymorph into a Tiny firefly, or back into its true form. While in firefly form, the adze cannot speak or manipulate objects, and it has a flying speed of 30 feet and can enter a hostile creature's space and stop there. Its statistics, other than its size and speed, are unchanged. Anything it is wearing transforms with it, but nothing it is carrying does.
Legendary Resistance (1/Day). If the adze fails a saving throw, it can choose to succeed instead.
Regeneration. The adze regains 10 hit points at the start of its turn if it has at least 1 hit point and hasn't taken radiant damage since its last turn. If the adze takes radiant damage, this trait doesn't function at the start of the adze's next turn.
Innate Spellcasting. The adze's innate spellcasting ability is Charisma (spell save DC 12). The adze can innately cast the following spells, requiring no material components:
Multiattack (Humanoid Form Only). The adze makes two claw attacks or one claw attack and one bite attack.
Claws (Humanoid Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) slashing damage. Instead of dealing damage, the adze can grapple the target (escape DC 14).
Bite (Humanoid Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) piercing damage plus 7 (2d6) necrotic damage. If the target is reduced to 0 hit points, it instead drops to 1 hit point and is mentally dominated by the adze as though under the effects of the dominate person spell, without a duration. The effect ends when the adze is killed or the dominated creature is killed.
Diseased Bite (Firefly Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: An unconscious creature hit by this attack must make a DC 14 Constitution saving throw or contract a disease. The diseased creature gets headaches, a fever, chills, and immediately takes three levels of exhaustion. The exhaustion remains until the creature is subjected to a lesser restoration spell or similar magic.
(Top image is Adze in firefly form while bottom image is Adze in Vampire form. Art Credit:Moth-Bat Hybrid Monster by Homeros-Gilani) The adze is a vampire that takes the form of a firefly, but if you capture one, it will revert to human appearance. This can be dangerous in itself, because in its human form the adze may attack and eat your organs, but it can be defeated. However, in the insect form, the adze will suck your blood while you sleep and spread disease, which is a possible explanation for outbreaks. Its preferred victims are young children. The victim of an adze becomes a witch who is possessed by the adze’s spirit.