Bier of Inquisition: This large stone platform casts speak with dead on any corpse lain upon it. This lasts for 5 minutes, and in this time the corpse can be asked up to two questions, and it answers as best it can. This does not work on undead.
If the corpse’s alignment differs from that of the person asking the question, the corpse gets a Will save (DC 14).
After the effect expires, the bier of inquisition will not work on that same corpse for a full week, nor will a standard speak with dead spell.
Caster Level: 5th;
Prerequisites: Craft Wondrous Item, speak with dead;
Market Price: 7,500 gp.
Source: Stronghold Builder's Guidebook