Good grief; I forgot about Awaken Undead. As the spell has a radius burst, one would need a specially constructed multi-level platform with an overall spherical shape; to get the most out of each casting, or make it a resettable trap.Pixels wrote:Libris Mortis has a copy of Awaken Undead, but it's a 7th level spell and costs 200 xp a pop. It's permanent rather than instantaneous, which means you can just dispel it. It's also dismissable, which on reflection is a horrifying. "Do as I say or I turn you back into a drooling automaton, no save."
I guess that a trap of Awaken used to awaken saplings into being labourers could also work.