Ghost (GEP)

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When clueless primes of great evil perish or when poor sods die a particularly traumatic or untimely death, their spirits sometimes linger to haunt the site of their passing. As spirits, these souls roam the Border Ethereal, forever looking with-longing or hatred across the Border toward the location where they died. Many ghosts in this state become embittered toward all who live, and they hunger to draw the living into the cold embrace of death.
Unlike most living creatures of the Ethereal, ghosts can be seen by creatures across the Border if the ghost so chooses. Fact is, violent ghosts can also partially phase into the adjacent plane in order to attack their victims. Even though a fully ethereal ghost can be seen by material beings, spells or any other physical attack cannot affect it. If the ghost chooses to semi-materialize in order to touch a victim, it becomes vulnerable to silver and magical weapons. Foes upon the Ethereal can attack ghosts according to normal rules for Ethereal combat (although a particularly canny ghost might semi-materialize in order to go mostly "out of phase" with berks completely on the Border!).
Note that other such haunting spirits also walk on the Border and remain visible upon the bordering plane. Examples of such spirits include the spectre and the wraith. (MONSTROUS MANUAL)
GHOST: AC 0 {B}; MV 9; HD 10; THAC0 11; #AT 1; Dmg Special; SA Age, magic jar; SD Unaffected by nonethereal attacks; SZ M (5-6' tall); ML Varies by individual; Int high (13-14); AL LE (usually); XP 7,000.
SA-Age: The touch of a ghost ages those it hits by 10–40 years. The mere sight of one (at the ghost's option) causes any humanoid being to age 10 years and flee in panic for 2d6 turns unless a saving throw vs. spell is successful. Priests above 6th level are immune to this effect, and all cutters above 8th level receive a +2 bonus to this saving throw. This power affects creatures on the Ethereal just like those on the adjacent plane.
Magic jar: Any creature within 180' of a ghost (either on the Border or upon the adjacent plane) is vulnerable to a magic jar attack as the spell.
SD-Only silver weapons (half damage), magical weapons (full damage), and holy water (2d4 damage) can affect a semimaterialized ghost.