Spectres are incorporeal undead often mistaken for ghosts. They haunt the places where they died, retaining their sentience but now hating all living things.
Alignment: lawful evil
Armor class: 18
Hit points: 75
Attack bonus: +6
Damage: 1d8+1 piercing-slashing damage; 20(x2) critical hits
Hit dice (level): 10
Challenge rating: 10
Turn resistance: +4Damage reduction: 10/+2
Trained skills:(‡) discipline (4), hide (17), listen (17), search (12), spot (17)
Feats: alertness, darkvision, weapon proficiency (creature)
A spectre has the usual undead immunities to critical hits, death magic, disease, level drain, ability drain, mind-affecting spells, paralysis, poison, and sneak attack. Furthermore, these monsters are incorporeal (which implies 50% concealment).
The attack of a spectre will drain 2 levels on-hit. In addition, a spectre can use an aura of unnatural twice per day.