FWIW, wights drain with their slam attacks. Any creature suffering its HD or more in negative levels dies. And rises as a wight.<br/><br/>So, how do you get their graveyards full of victims? All their victims rise as wights, right? I'll go out on a limb and apply the same limitations of<em>animate dead</em>to this process (and to the<em>create undead</em>spells, too). The corpse must be mostly intact. If the wight intentionally mangles it to not be "mostly intact," either before or after killing the creature, no wight rises. I wouldn't let this happen in the course of normal D&D combat, though. Coup de grace would be an exception, but normal (ie, it involves PCs and no special effects like vorpal weapons) combat doesn't allow for this.<br/><br/>But yeah, a wight general, acting alone or for a necromancer.... But how do they get themselves out of the locked chambers?