In the darkness ahead of you, you can see a small girl floating between two trees. Her face is hazy, and a ghostly cough seems to be emanating from behind her. She holds up her clawed hand, and you feel a sudden cold in your lungs.
Acheri CR 3
NE Small Undead (Incorporeal)
Init +6; Senses Darkvision 60 ft. ; Perception +7
AC 16, Touch 16, flatfooted 14; (+3 Deflection, +2 Dex, +1 size)
hp 22 (3d8+9)
Fort +1, Ref +3, Will +6
Speed Fly 30 ft. (perfect)
Melee Incorporeal Touch +5 melee (1d4 plus cursed disease)
Space 5 ft.; Reach 5 ft.
Str ---, Dex 15, Con ---, Int 11, Wis 12, Cha 16
Base Atk +2; CMB +2; CMD 16
Feats Improved Initiative, Iron Will
Skills Fly +8, Perform (Dance) +5, Sense Motive +3
Languages Culture-dependent (often Ojibwe)
Cursed Disease (Su): If an acheri uses its claw attacks on a living victim, the creature must make a Fortitude save (DC 14), or come into contact with the disease that killed the acheri in life. Different acheris have different diseases, but common ones include dysentery, cholera, filth fever, tuberculosis, or typhoid fever. In addition, once per day may curse a victim within 60 ft. of itself, forcing the target to make the save even if they have not been hit with the acheri's claw attacks. Regardless of whether or not they succeed on the save, all victims of this ability are immune to this ability for 24 hours. After becoming infected, the victim must beat the disease's normal DC rather than the DC of the acheri's ability in order to be cured. The save DC of this ability is Charisma-based.
Rejuvenation (Su): In most cases, itís difficult to destroy an acheri through simple combat: The "destroyed" spirit will often restore itself in 2d4 days. Even the most powerful spells are usually only temporary solutions. An acheri that would otherwise be destroyed returns to its old haunts with a successful level check (1d20 + acheriís HD) against DC 13. If someone were to cast remove disease on the acheri and then kill it within an hour of performing the spell, the acheri cannot rejuvenate. Otherwise, the only way to reliably kill an acheri is to find its corpse and wrap red ribbons around its neck and ankles (at which point the spirit ceases to exist immediately).
Environment: Temperate Forests
Life is not always easy at the farthest reaches of civilization, and death is something that must be accepted. Of course, the death of a child is never easy, but it can become a hundred times worse when the child angrily lashes out from beyond the grave. Those children who are killed by disease sometimes return to this world as violent spirits known as acheris. These incorporeal undead, taking the form of floating gray-skinned children, wish to inflict their fate upon others.
It is said that acheri visit nearby towns in the dead of night, dancing in the center and inviting other children to leave their beds and dance with them. It is only then that the spirits reveal their true nature, digging their shadowy claws into the tender flesh of their victims and infecting them with a plague. Acheris often let their victims live, allowing them to run bleeding and crying back to their parents. They delight in watching these children inadvertently spread the disease, becoming engrossed in the resulting misery with an appropriately child-like glee.
Acheri are very strongly tied to this world, and as a result it can be very difficult to finally put such creatures to rest. The most reliable way to do so is to find out who the acheri was in life, and tying red ribbons around their necks and ankles. Red is a symbol of purity, and it is said that by purifying the corpse you cut the link that keeps the monstrous spirit here.