Moathouse: Planting 12, Early Morning

While he is unable to identify its source, the strange black and purple stone that make up the walls of the chamber does not seem to be natural.

As Cade examines the altar, his hand brushes against it. Seeming to react to this, the color stone begins to fade. It slowly turns from black to a transluscent purple color. After a few seconds, it seems less like the color is just fading, but that all the black pigment is retreating into the center of the altar, where it forms an amorphous blob.