DynamoHum
Dynamo, if you're interested in the psychomanteum, Raymond Moody is the expert on this, wrote about it in his book Reunions: Visionary Encounters with Departed Loved Ones, still available but from about 1993 iirc. Antecedent of the psychomanteum is the Oracle at Delphi, btw. I've done it three times, actually, had some experience, but nothing dramatic. Would love to try it again, though. Usually you need to do a longer time than 15 minutes, though, often an hour or more is better.
Moody has a formal one in Alabama that you can go to, but I'm sure you could find one somewhere nearer to you.
If you want to know more, please feel free to contact me offline.