Hoarder dragon

Hoarder dragons were undead dragons who were so thoroughly greedy, they refused to leave their hoards after death, haunting them somewhat similarly yo ghosts.

Description
Initially, a horde dragon appeared to be nothing but an unguarded treasure hoard that radiated almost palpable aura of terror and dread. If an unwise adventurer touched anything in the hoard, it came to life. The treasures took shape of a dragon, with gems, coins, jeweled daggers, and magic swords. Very often hoarder dragons used gemstones for their eyes of the same color as their scales in life.

Personality
Hoarder dragons were ruled by their all-consuming greed in life, and in death they refused to abandon their troves, damming them to haunt their treasures eternally. Unwilling to lose a single copper from their hoard, they possessed the treasure, defending it with their undead lives.

It was believed that the dragons who worshiped Task, the draconic god of avarice, were transformed in death into hoarder dragons as a reward for their service.

Combat
Hoarder dragons liked to ambush the thieves by laying in wait in the Ethereal plane. They surprised the opponents by appearing on Prime Material plane and animating the mountain of treasure to smite the foes.

Defending their treasures, hoarder dragons used any items found among their treasures when threatened. Most of the time they used their animated contract-like bodies to slam claw and bite at thieves and their breath weapons.