I'm going to discuss the sound files now, so if you don't want spoilers, don't read any further.
What we can take from these files is that tens of thousands of years sealed away after Lei Shen's betrayal has done very little for Ra-Den's sanity. He clearly wants to share some of that long suffering with the first people who find him... which looks to be the first group to get past Lei Shen, unfortunately for them. Even more interesting is what Ra-Den has to say after he fights mortal heroes. I'll leave that up to you to listen to, but it has dire implications for the future.
Things are gonna get interesting.
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