concept: Sentient Fungal Behemoth
Found mostly in uncharted or unexplored areas, these travelling fungi feed on large carcasses of animals. The are frequently found in dragon cementaries, where plenty of food is available. When moving, they emmit a bright light from their sensorial eye-like organ, illuminating a short distance. Since gargatuan mushrooms are not uncommon in the regions that the Sentient Fungal Behemoths can be found, they can stay very still and mimick these large mushrooms. They do this to escape potentially dangerous situacions, though their tentacles can be used as melee weapons if hidding fails.
The light emmiting organ, if cut out, can be sold for quite a high price. Its tough as amber but fairly easy to cut out. Even if removed from the body, the amber-like organ still shines with bright light if moved around. Scholars argue that this is due to a chemical reaction, but for some the light is actually magic.
Read more: http://www.conceptart.org/forums/showthread.php/60993-C-O-W-036-White-Skinned-Dragon-Eater-VOTING!!!#ixzz3R4MLhzmr