Hello Solar Leo Queen The stone room represents your inner self. The crystal ball represents a connection to your inner self, to your unconscious. The story represents the message being relayed from your unconscious.
The message is certainly about self-sacrifice, and in that I agree with the others, but to what degree I do not know.
At the least, if you can call it that, the dream could suggest that you need to willingly end/"kill"/sacrifice some aspect of self for the good of the whole Self. Death however, is not truly an ending, but a transformation. So the "death" of this sacrificed aspect of self changes/transforms/transmutes it so that it becomes one with another aspect, in the quest for the Self to become whole, or One. It is a process. This inner shift is then reflected in your outer world, affecting those around you.
How far this reaches out as an effect to others, I do not know, but the dream seems to give it some amount of importance.
Past life connections? Could be. A process outlined by Ascended Masters? Likely.
Does this make any sense? What do you think?