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Medium undead, chaotic evil
Damage Resistances acid, cold, fire, lightning, thunder; bludgeoning, piercing, and slashing from nonmagical attacks
Incorporeal Movement. The specter can move through other creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.
Life Drain. Melee Spell Attack: +4 to hit, reach 5 ft., one creature. Hit: 10 (3d6) necrotic damage. The target must succeed on a DC 10 Constitution saving throw or its hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the creature finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.
A specter is the angry, unfettered spirit of a humanoid that has been prevented from passing to the afterlife. Specters no longer possess connections to who or what they were, yet are condemned to walk the world forever. Some are spawned when dark magic or the touch of a wraith rips a soul from a living body.
Beyond Redemption. When a ghost's unfinished business is completed, it can rest at last. No such rest or redemption awaits a specter. It is doomed to the Material Plane, its only end the oblivion that comes with the destruction of its soul. Until then, it bears out its lonely life in forlorn places, carrying on forgotten through the ages of the world.
Undying Hatred. Living creatures remind the specter that life is beyond its grasp. The mere sight of the living overwhelms a specter with sorrow and wrath, which can be abated only by destroying said life. A specter kills quickly and mercilessly, for only by depriving others of life can it gain the slightest satisfaction. However, no matter how many lives it extinguishes, a specter always succumbs to its hatred and sorrow.
Dwellers in Darkness. Sunlight represents a source of life that no specter can ever hope to douse, and it pains them. When night falls, they leave their final resting places in search of living creatures to slay, knowing that few weapons can harm them in return. At the first light of dawn, they retreat back into the darkness, where they remain until night falls again.
Undead Nature. A specter doesn't require air, food, drink, or sleep.
A poltergeist is a different kind of specter — the confused, invisible spirit of an individual with no sense of how he or she died. A poltergeist expresses its rage by hurling creatures and objects using the power of its shattered psyche.
Invisibility. The poltergeist is invisible.
The poltergeist has the following action options in place of the specter's Life Drain:
Forceful Slam. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 10 (3d6) force damage.
Telekinetic Thrust. The poltergeist targets a creature or unattended object within 30 feet of it. A creature must be Medium or smaller to be affected by this magic, and an object can weigh up to 150 pounds.