Ethereal Sight. The ectoplasm can see 60 feet into the Ethereal Plane when it is on the Material Plane, and vice versa.
Amorphous/Incorporeal. The ectoplasm can move through a space as narrow as 1 inch wide without squeezing. The ectoplasm can also 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.
Death Eater. When a creature that isn't an undead or a construct dies within 5 feet of the ectoplasm, the ectoplasm regains hit points equal to the creature's Constitution score.
Deathly Form. Any non-undead creature that touches the ectoplasm or hits it with a melee attack while within 5 feet of it takes 7 (2d6) necrotic damage plus 4 (1d8) psychic damage.
Ephemeral. The ectoplasm can't wear or carry anything.
Ethereal Sight. The ectoplasm can see 60 feet into the Ethereal Plane when it is on the Material Plane, and vice versa.
Necrotic Absorption. Whenever the ectoplasm is subjected to necrotic damage, it takes no damage and regains a number of hit points equal to the necrotic damage dealt.
Weird Ooze Hybrid. The ectoplasm is also an aberration and an ooze.
Tendril. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 14 (4d6) necrotic damage plus 9 (2d8) damage, and if the target is not undead, it must succeed on a DC 12 Wisdom saving throw or be frightened for 1 minute. If the save fails by 5 or more, the target also ages 1d4 × 5 years. A frightened target can repeat the saving throw at the end of each of its turns, ending the frightened condition on itself on a success. If a target's saving throw is successful or the effect ends for it, the target is immune to this effect from any ectoplasm for the next 24 hours. The aging effect can be reversed with a greater restoration spell, but only within 24 hours of it occurring.
Etherealness. The ectoplasm enters the Ethereal Plane from the Material Plane, or vice versa. It is visible on the Material Plane while it is in the Border Ethereal, and vice versa, yet it can't affect or be affected by anything on the other plane.
Split. When an ectoplasm that is Small or larger is subjected to lightning or slashing damage, it splits into two new ectoplasms if it has at least 20 hit points. Each new ectoplasm has hit points equal to half the original ectoplasm's, rounded down. New ectoplasms are one size smaller than the original ectoplasm until they are no longer missing any hit points.
Description
The extradimensional slime known as ectoplasm can be found strewn all throughout the Ethereal Plane. Spirits such as ghosts and banshees often leave ectoplasm in a trail when they are injured, and may end up smearing the ethereal and invisible substance over the physical objects that they interact with. Ectoplasm is soul energy condensed into physical form and is harmless by itself.
In rare cases, ectoplasm can become infused with psychic energy, such as in places where the Ethereal Plane intersects with rifts that lead to the Far Realm. When this happens, the ectoplasm can become sentient.
Sentient ectoplasm floats aimlessly, seeking creatures infused with the energy of life or undeath. It reaches out for any energy that it senses, draining vitality from the target just like the touch of a ghost or banshee.
Undead Nature. Sentient ectoplasm doesn't require air, food, drink, or sleep.
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