Wight

Corpses of humans or demihumans, possessed by malevolent spirits.

AC5 [14], HD3* (13hp),
Att 1 × touch (energy drain), THACO 17 [+2],
MV 90’ (30’), SV D12 W13 P14 B15 S16 (3),
ML 12, AL Chaotic, XP 50, NA 1d6 (1d8), TT B

• Undead: Make no noise, until they attack. Immune to effects that affect living creatures (e.g. poison). Immune to mind-affecting or mind-reading spells (e.g. charm, hold, sleep).
• Mundane damage immunity: Only harmed by silver weapons or magic.
• Energy drain: A successfully hit target permanently loses one experience level (or Hit Die). This incurs a loss of one Hit Die of hit points, as well as all other benefits due to the drained level (e.g. spells, saving throws, etc.). A character’s XP is reduced to halfway between the former and new levels. A person drained of all levels becomes a wight in 1d4 days, under the control of the wight that killed them.

Source: Classic Fantasy