Ancient Lava Furnace

Ancient Lava Furnace is a piece of scenery in the lower depths of Legends caverns. A hunk of crystal, a lump of crystal and a chunk of crystal are used on the furnace during Legend's Quest. Moulding them into a red crystal requires level 50 Crafting.

When searched, the quest chat will notify:
 * You search the lava furnace.
 * You find a small compartment that you may be able to use.
 * Strangely, it looks as if it is designed for a specific purpose...
 * to fuse things together at very high temperatures...

When a crystal piece is used on the furnace:
 * You carefully place the piece of crystal into
 * a specially shaped compartment in the furnace.
 * The compartment in the furnace isn't full yet.
 * It looks like you need more pieces of crystal.

On the final crystal piece:
 * You place the final segment of the crystal together into the
 * strangely shaped compartment, all the pieces seem to fit...
 * You use your crafting skill to control the furnace.
 * The heat in the furnace slowly rises and soon fuses the parts together...
 * As soon as the item cools, you pick it up...
 * As the crystal touches your hands a voice inside of your head says...
 * Voice in head: Bring life to the dragons eye.

Using all three pieces on the furnace produces the red crystal.